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The Aberdeen Maritime Museum, located in Shiprow, tells the story of Aberdeen's links with the sea from the days of sail and clipper ships to the latest oil and gas exploration technology. It includes an model of the Murchison oil production platform and a 19th-century assembly taken from Rattray Head lighthouse Provost Ross' House is the second oldest dwelling house in the city. It was built in 1593 and became the residence of Provost John Ross of Arnage in 1702. The house retains some original medieval features, including a kitchen, fireplaces and beam-and-board ceilings. The Gordon Highlanders Museum tells the story of one of Scotland's best known regiments. Provost Skene's House on Flourmill Lane dates from 1545 and is the oldest surviving townhouse in the city. It reopened in October 2021 after significant refurbishment costing £3.8m. One of the new exhibitions is a Hall of Heroes featuring 100 Aberdonians who have made a significant contribution to the city. The Tollbooth Museum on the Castlegate (currently closed to visitors) is a former jail, which first opened as a public museum in 1995.
The Aberdeen Treasure Hub is a storage facility for Aberdeen Museums and Galleries containing over 100,000 items. The store is open for infrequent tours, for example as part of Doors Open Day. Marischal Museum holds the principal collections of the University of Aberdeen, comprising some 80,000 items in the areas of fine art, Scottish history and archaeology, and European, Mediterranean and Near Eastern archaeology. The permanent displays and reference collections are augmented by regular temporary exhibitions, and since its closure to the public it now has a virtual online presence It closed to the public in 2008. The King's Museum acts as the main museum of the university now. Festivals and performing arts. Aberdeen is home to a number of events and festivals including the Aberdeen International Youth Festival (the world's largest arts festival for young performers), Aberdeen Jazz Festival, Aberdeen Alternative Festival, Rootin' Aboot (a folk and roots music event), Triptych, the University of Aberdeen's annual May Fest (formerly the Word festival) and DanceLive, Scotland's only festival of contemporary dance, produced by the city's Citymoves dance organisation.
The Aberdeen Student Show, performed annually without interruption since 1921, under the auspices of the Aberdeen Students' Charities Campaign, is the longest-running of its kind in the United Kingdom. It is written, produced and performed by students and graduates of Aberdeen's universities and higher education institutions. Since 1929—other than on a handful of occasions—it has been staged at His Majesty's Theatre. National festivals which visited Aberdeen in 2012 included the British Science Festival in September, hosted by the University of Aberdeen but with events also taking place at Robert Gordon University and at other venues across the city. In February 2012 the University of Aberdeen also hosted the Inter Varsity Folk Dance Festival, the longest-running folk festival in the United Kingdom. Aberdeen is home to Spectra, an annual light festival hosted in different locations across the city. Aberdeen is home to Nuart, a festival showcasing street art around the city. The festival has run since 2017. In 2020, the WayWORD Festival was launched by the University of Aberdeen WORD centre for creative writing. This yearly programme celebrates the arts through readings, performances, workshops and discussion panels. There have been many notable headliners including Val McDermid, Irvine Welsh and Douglas Stuart (writer).
Dialect. The local dialect of Lowland Scots is often known as Doric and is spoken not just in the city, but across the northeast of Scotland. It differs somewhat from other Scots dialects: most noticeable are the pronunciation "f" for what is normally written "wh" and "ee" for what in standard English would usually be written "oo" (Scots "ui"). Every year the annual Doric Festival takes place in Aberdeenshire to celebrate the history of the north-east's language. Media and music. Aberdeen is home to Scotland's oldest newspaper the "Press and Journal", a local and regional newspaper first published in 1747. The "Press and Journal" and its sister paper the tabloid "Evening Express" are printed six days a week by Aberdeen Journals. There was one free newspaper, the "Aberdeen Citizen". BBC Scotland has a network studio production base in the city's Beechgrove area, and BBC Aberdeen produces "The Beechgrove Potting Shed" for radio while Tern Television produces "The Beechgrove Garden". The city is also home to STV North (formerly Grampian Television), which produces the regional news programmes such as "STV News at Six", as well as local commercials. The station, based at Craigshaw Business Park in Tullos, was based at larger studios in Queens Cross from September 1961 until June 2003.
There are three commercial radio stations operating in the city, Northsound 1, Greatest Hits Radio North East Scotland, and independent station Original 106, along with the community radio station shmu FM managed by Station House Media Unit which supports community members to run Aberdeen's full-time community radio station, broadcasting on 99.8 MHz FM. Music venues include Aberdeen Music Hall and the P&J Live. Food. The Aberdeen region has given its name to a number of dishes, including the Aberdeen buttery (also known as "rowie") and Aberdeen Sausage. In 2015, a study was published in The Scotsman which analysed the presence of branded fast food outlets in Scotland. Of the ten towns and cities analysed, Aberdeen was found to have the lowest per capita concentration, with just 0.12 stores per 1,000 inhabitants. Public services. The public health service in Scotland, NHS Scotland provides for the people of Aberdeen through the NHS Grampian health board. Aberdeen Royal Infirmary is the largest hospital in the city and one of the largest in Europe (the location of the city's A&E department), Royal Aberdeen Children's Hospital, a paediatric hospital, Royal Cornhill Hospital for mental health, Aberdeen Maternity Hospital, an antenatal hospital, Woodend Hospital, which specialises in rehabilitation and long-term illnesses and conditions, and City Hospital and Woolmanhill Hospital, which host several out-patient clinics and offices. Albyn Hospital is a private hospital located in the west end of the city.
Aberdeen City Council is responsible for city-owned infrastructure which is paid for by a mixture of Council Tax and income from the Scottish Government. Infrastructure and services run by the council include: nursery, primary and secondary education, roads, clearing snow in winter, city wardens, maintaining parks, refuse collection, economic development, public analyst, public mortuary, street cleaning and street lighting. Infrastructure in private hands includes electricity, gas and telecoms. Water and sewerage services are provided by Scottish Water. Sport. Football. The first ever recorded game of football, was outlined by teacher David Wedderburn in his book "Vocabula" written in 1633, during his time teaching at Aberdeen Grammar School. There are two Aberdeen-based football clubs in the SPFL. Aberdeen F.C. (The Dons) play in the Scottish Premiership at Pittodrie Stadium. The club won the European Cup Winners Cup and the European Super Cup in 1983, the Scottish Premier League Championship four times (1955, 1980, 1984 and 1985), and the Scottish Cup seven times (1947, 1970, 1982, 1983, 1984, 1986 and 1990). Under the management of Alex Ferguson, Aberdeen was a major force in British football during the 1980s.
After 8 seasons in charge, the most recent of Managers Derek McInnes, was relieved of his duties, the club's failure to achieve anything more than 1 trophy in 24 competitions during his tenure and a recent run of games which saw 1 goal in ten matches ultimately proved costly for the Manager and his Assistant Tony Docherty. Under the management of McInnes the team won the 2014 Scottish League Cup and followed it up with a second-place league finish for the first time in more than 20 years in the following season. But it was over the last few seasons that results stagnated and McInnes was replaced by former Aberdeen and Newcastle player Stephen Glass. The current manager is Jimmy Thelin. Cove Rangers, as of season 2024-25 play in League One, at the Balmoral Stadium in the suburb of Cove Bay. Cove won the Highland Football League championship in 2001, 2008, 2009, 2013 and 2019, winning the League Two play-offs in 2019 and earning promotion. At the point at which the 2019/20 League Two season was curtailed due to the COVID-19 pandemic, Cove were sitting top of the League Two table and were promoted as Champions.
Other local teams include Banks o'Dee who play at Spain Park in the Highland Football League and members of the SJFA North Region; Culter, Dyce, Stoneywood Parkvale, Glentanar, Sunnybank Hall Russell United, Bridge of Don Thistle and Hermes. Rugby Union. Aberdeen hosted Caledonia Reds, a Scottish rugby team, before they merged with the Glasgow Warriors in 1998. The city is also home to the Scottish Premiership Division One rugby club Aberdeen GSFP RFC who play at Rubislaw Playing Fields, and Aberdeenshire RFC which was founded in 1875 and runs Junior, Senior Men's, Senior Ladies and Touch sections from the Woodside Sports Complex and also Aberdeen Wanderers RFC. In 2005 the President of the SRU said it was hoped eventually to establish a professional team in Aberdeen. In November 2008 the city hosted a rugby international at Pittodrie between Scotland and Canada, with Scotland winning 41–0. In November 2010 the city once again hosted a rugby international at Pittodrie between Scotland and Samoa, with Scotland winning 19–16.
Rugby League. Aberdeen Warriors rugby league team play in the Rugby League Conference Division One. The Warriors also run Under 15's and 17's teams. Aberdeen Grammar School won the Saltire Schools Cup in 2011. Golf. The Royal Aberdeen Golf Club, founded in 1780 is the sixth oldest golf club in the world, and hosted the Senior British Open in 2005, and the amateur team event the Walker Cup in 2011. Royal Aberdeen also hosted the Scottish Open in 2014, won by Justin Rose. The club has a second course, and there are public golf courses at Auchmill, Balnagask, Hazlehead and King's Links. There are new courses planned for the area, including world-class facilities with major financial backing, the city and shire are set to become important in golf tourism. In Summer 2012, Donald Trump opened a new state of the art golf course at Menie, just north of the city, as the Trump International Golf Links, Scotland. Other sports. The City of Aberdeen Swim Team (COAST) was based in Northfield swimming pool, but since the opening of the Aberdeen Aquatics Centre in 2014, it is now based there, as it has a 50 m pool as opposed to the 25 m pool at Northfield. It has been in operation since 1996. The team comprises several smaller swimming clubs and has enjoyed success throughout Scotland and in international competitions. Three of the team's swimmers qualified for the 2006 Commonwealth Games. There are four boat clubs that row on the River Dee: Aberdeen Boat Club (ABC), Aberdeen Schools Rowing Association (ASRA), Aberdeen University Boat Club (AUBC) and Robert Gordon University Boat Club (RGUBC).
The city has one national league side, Stoneywood-Dyce. Local "Grades" cricket has been played in Aberdeen since 1884. Aberdeenshire were the 2009 and 2014 Scottish National Premier League and Scottish Cup Champions.Aberdeen Lynx are an ice hockey team that plays in the Scottish National League and is based at the Linx Ice Arena. Aberdeen University Shinty Club (Scottish Gaelic: Club Camanachd Oilthigh Obar Dheathain) is the oldest constituted shinty club in the world, dating back to 1861. The city council operates public tennis courts in various parks including an indoor tennis centre at Westburn Park. The Beach Leisure Centre is home to a climbing wall, gymnasium and a swimming pool. There are numerous swimming pools dotted around the city notably the largest, the Bon Accord Baths which closed down in 2008. In common with many other major towns and cities in the UK, Aberdeen has an active roller derby league, Granite City Roller Derb. The Aberdeen Roughnecks American football club is a new team that started in 2012 and is the first team that Aberdeen has witnessed since the Granite City Oilers that began in 1986 and were wound up in the mid-1990s.Aberdeen Oilers Floorball Club was founded in 2007. The club initially attracted a range of experienced Scandinavian and other European players who were studying in Aberdeen. Since their formation, Aberdeen Oilers have played in the British Floorball Northern League and went on to win the league in the 2008/09 season. The club played a major role in setting up a ladies league in Scotland. The Oilers' ladies team ended up second in the first ladies league season (2008/09). Twin cities. Aberdeen is twinned with
Antipope An antipope () is a person who claims to be Bishop of Rome and leader of the Roman Catholic Church in opposition to the legitimately elected pope. Between the 3rd and mid-15th centuries, antipopes were supported by factions within the Church itself and secular rulers. Sometimes it was difficult to distinguish which of two claimants should be called pope and which antipope, as in the case of Pope Leo VIII and Pope Benedict V. History. Hippolytus of Rome (d. 235) is commonly considered to be the earliest antipope, as he headed a separate group within the Church in Rome against Pope Callixtus I. Hippolytus was reconciled to Callixtus's second successor, Pope Pontian, and both he and Pontian are honoured as saints by the Catholic Church with a shared feast day on 13 August. Whether two or more persons have been confused in this account of Hippolytus and whether Hippolytus actually declared himself to be the Bishop of Rome remains unclear, since no such claim by Hippolytus has been cited in the writings attributed to him.
Eusebius quotes from an unnamed earlier writer the story of Natalius, a 3rd-century priest who accepted the bishopric of the Adoptionists, a heretical group in Rome. Natalius soon repented and tearfully begged Pope Zephyrinus to receive him into communion. Novatian (d. 258), another third-century figure, certainly claimed the See of Rome in opposition to Pope Cornelius, and if Natalius and Hippolytus were excluded because of the uncertainties concerning them, Novatian could then be said to be the first antipope. The period in which antipopes were most numerous was during the struggles between the popes and the Holy Roman Emperors of the 11th and 12th centuries. The emperors frequently imposed their own nominees to further their own causes. The popes, likewise, sometimes sponsored rival imperial claimants (anti-kings) in Germany to overcome a particular emperor. The Western Schism – which began in 1378, when the French cardinals, claiming that the election of Pope Urban VI was invalid, elected antipope Clement VII as a rival to the Roman Pope – led eventually to two competing lines of antipopes: the Avignon line as Clement VII moved back to Avignon, and the Pisan line. The Pisan line, which began in 1409, was named after the town of Pisa, Italy, where the (Pisan) council had elected antipope Alexander V as a third claimant. To end the schism, in May 1415, the Council of Constance deposed antipope John XXIII of the Pisan line. Pope Gregory XII of the Roman line resigned in July 1415. In 1417, the council also formally deposed antipope Benedict XIII of Avignon, but he adamantly refused to resign. Afterwards, Pope Martin V was elected and was accepted everywhere except in the small and rapidly diminishing area of influence of Benedict XIII.
List of historical antipopes. The following table gives the names of the antipopes included in the list of popes and antipopes in the "Annuario Pontificio", with the addition of the names of Natalius (in spite of doubts about his historicity) and Antipope Clement VIII (whose following was insignificant). An asterisk marks those who were included in the conventional numbering of later popes who took the same name. More commonly, the antipope is ignored in later papal regnal numbers; for example, there was an Antipope John XXIII, but the new Pope John elected in 1958 was also called John XXIII. For the additional confusion regarding popes named John, see Pope John numbering. The list of popes and antipopes in the "Annuario Pontificio" attaches the following note to the name of Pope Leo VIII (963–965): At this point, as again in the mid-11th century, we come across elections in which problems of harmonising historical criteria and those of theology and canon law make it impossible to decide clearly which side possessed the legitimacy whose factual existence guarantees the unbroken lawful succession of the successors of Saint Peter. The uncertainty that in some cases results has made it advisable to abandon the assignation of successive numbers in the list of the popes.
Thus, because of the obscurities about mid-11th-century canon law and the historical facts, the "Annuario Pontificio" lists Sylvester III as a pope, without thereby expressing a judgement on his legitimacy. The "Catholic Encyclopedia" places him in its "List of Popes", but with the annotation: "Considered by some to be an antipope". Other sources classify him as an antipope. As Celestine II resigned before being consecrated and enthroned in order to avoid a schism, Oxford's "A Dictionary of Popes" (2010) considers he "...is classified, unfairly, as an antipope", an opinion historian Salvador Miranda also shares. Those with asterisks (*) were counted in subsequent papal numbering. Quasi-cardinal-nephews. Many antipopes created cardinals, known as "quasi-cardinals", and a few created cardinal-nephews, known as "quasi-cardinal-nephews". Modern minor claimants. Antipopes still exist today, but all are minor claimants, without the support of any Cardinal. Examples include Palmarians, Apostles of Infinite Love Antipopes, and an unknown number of many other Sedevacantist claimants.
Antipope of Alexandria. As the Patriarch of Alexandria (Egypt) has historically also held the title of pope, a person who, in opposition to someone who is generally accepted as a legitimate pope of Alexandria, claims to hold that position may also be considered an antipope. Coptic lector Max Michel became an antipope of Alexandria, calling himself Maximos I. His claim to the Alexandrine papacy was dismissed by both the Coptic Orthodox Pope Shenouda III and Pope Theodore II of the Greek Orthodox Church of Alexandria. The Coptic pope of Alexandria and the Greek pope of Alexandria currently view one another, not as antipopes, but rather as successors to differing lines of apostolic succession that formed as a result of christological disputes in the fifth century. In fiction. Antipopes have appeared as fictional characters. These may be either in historical fiction, as fictional portraits of well-known historical antipopes or as purely imaginary antipopes.
Aquaculture Aquaculture (less commonly spelled aquiculture), also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants (e.g. lotus). Aquaculture involves cultivating freshwater, brackish water, and saltwater populations under controlled or semi-natural conditions and can be contrasted with commercial fishing, which is the harvesting of wild fish. Aquaculture is also a practice used for restoring and rehabilitating marine and freshwater ecosystems. Mariculture, commonly known as marine farming, is aquaculture in seawater habitats and lagoons, as opposed to freshwater aquaculture. Pisciculture is a type of aquaculture that consists of fish farming to obtain fish products as food. Aquaculture can also be defined as the breeding, growing, and harvesting of fish and other aquatic plants, also known as farming in water. It is an environmental source of food and commercial products that help to improve healthier habitats and are used to reconstruct the population of endangered aquatic species. Technology has increased the growth of fish in coastal marine waters and open oceans due to the increased demand for seafood.
Aquaculture can be conducted in completely artificial facilities built on land (onshore aquaculture), as in the case of fish tank, ponds, aquaponics or raceways, where the living conditions rely on human control such as water quality (oxygen), feed or temperature. Alternatively, they can be conducted on well-sheltered shallow waters nearshore of a body of water (inshore aquaculture), where the cultivated species are subjected to relatively more naturalistic environments; or on fenced/enclosed sections of open water away from the shore (offshore aquaculture), where the species are either cultured in cages, racks or bags and are exposed to more diverse natural conditions such as water currents (such as ocean currents), diel vertical migration and nutrient cycles. According to the Food and Agriculture Organization (FAO), aquaculture "is understood to mean the farming of aquatic organisms including fish, molluscs, crustaceans and aquatic plants. Farming implies some form of intervention in the rearing process to enhance production, such as regular stocking, feeding, protection from predators, etc. Farming also implies individual or corporate ownership of the stock being cultivated." The reported output from global aquaculture operations in 2019 was over 120 million tonnes valued at US$274 billion, by 2022, it had risen to 130.9 million tonnes, valued at USD 312.8 billion. However, there are issues with the reliability of the reported figures. Further, in current aquaculture practice, products from several kilograms of wild fish are used to produce one kilogram of a piscivorous fish like salmon. Plant and insect-based feeds are also being developed to help reduce wild fish being used for aquaculture feed.
Particular kinds of aquaculture include fish farming, shrimp farming, oyster farming, mariculture, pisciculture, algaculture (such as seaweed farming), and the cultivation of ornamental fish. Particular methods include aquaponics and integrated multi-trophic aquaculture, both of which integrate fish farming and aquatic plant farming. The FAO describes aquaculture as one of the industries most directly affected by climate change and its impacts. Some forms of aquaculture have negative impacts on the environment, such as through nutrient pollution or disease transfer to wild populations. Overview. Harvest stagnation in wild fisheries and overexploitation of popular marine species, combined with a growing demand for high-quality protein, encouraged aquaculturists to domesticate other marine species. At the outset of modern aquaculture, many were optimistic that a "Blue Revolution" could take place in aquaculture, just as the Green Revolution of the 20th century had revolutionized agriculture. Although land animals had long been domesticated, most seafood species were still caught from the wild. Concerned about the impact of growing demand for seafood on the world's oceans, prominent ocean explorer Jacques Cousteau wrote in 1973: "With earth's burgeoning human populations to feed, we must turn to the sea with new understanding and new technology."
About 430 (97%) of the species cultured were domesticated during the 20th and 21st centuries, of which an estimated 106 came in the decade to 2007. Given the long-term importance of agriculture, to date, only 0.08% of known land plant species and 0.0002% of known land animal species have been domesticated, compared with 0.17% of known marine plant species and 0.13% of known marine animal species. Domestication typically involves about a decade of scientific research. Domesticating aquatic species involves fewer risks to humans than do land animals, which took a large toll in human lives. Most major human diseases originated in domesticated animals, including diseases such as smallpox and diphtheria, that like most infectious diseases, move to humans from animals. No human pathogens of comparable virulence have yet emerged from marine species. Biological control methods to manage parasites are already being used, such as cleaner fish (e.g. lumpsuckers and wrasse) to control sea lice populations in salmon farming. Models are being used to help with spatial planning and siting of fish farms in order to minimize impact.
The decline in wild fish stocks has increased the demand for farmed fish. However, finding alternative sources of protein and oil for fish feed is necessary so the aquaculture industry can grow sustainably; otherwise, it represents a great risk for the over-exploitation of forage fish. Aquaculture production now exceeds capture fishery production and together the relative GDP contribution has ranged from 0.01 to 10%. Singling out aquaculture's relative contribution to GDP, however, is not easily derived due to lack of data. Another recent issue following the banning in 2008 of organotins by the International Maritime Organization is the need to find environmentally friendly, but still effective, compounds with antifouling effects. Many new natural compounds are discovered every year, but producing them on a large enough scale for commercial purposes is almost impossible. It is highly probable that future developments in this field will rely on microorganisms, but greater funding and further research is needed to overcome the lack of knowledge in this field.
Species groups. Aquatic plants. Microalgae, also referred to as phytoplankton, microphytes, or planktonic algae, constitute the majority of cultivated algae. Macroalgae commonly known as seaweed also have many commercial and industrial uses, but due to their size and specific requirements, they are not easily cultivated on a large scale and are most often taken in the wild. In 2016, aquaculture was the source of 96.5 percent by volume of the total 31.2 million tonnes of wild-collected and cultivated aquatic plants combined. Global production of farmed aquatic plants, overwhelmingly dominated by seaweeds, grew in output volume from 13.5 million tonnes in 1995 to just over 30 million tonnes in 2016. Fish. The farming of fish is the most common form of aquaculture. It involves raising fish commercially in tanks, fish ponds, or ocean enclosures, usually for food. A facility that releases juvenile fish into the wild for recreational fishing or to supplement a species' natural numbers is generally referred to as a fish hatchery. Worldwide, the most important fish species used in fish farming are, in order, carp, salmon, tilapia, and catfish.
In the Mediterranean, young bluefin tuna are netted at sea and towed slowly towards the shore. They are then interned in offshore pens (sometimes made from floating HDPE pipe) where they are further grown for the market. In 2009, researchers in Australia managed for the first time to coax southern bluefin tuna to breed in landlocked tanks. Southern bluefin tuna are also caught in the wild and fattened in grow-out sea cages in southern Spencer Gulf, South Australia. A similar process is used in the salmon-farming section of this industry; juveniles are taken from hatcheries and a variety of methods are used to aid them in their maturation. For example, as stated above, some of the most important fish species in the industry, salmon, can be grown using a cage system. This is done by having netted cages, preferably in open water that has a strong flow, and feeding the salmon a special food mixture that aids their growth. This process allows for year-round growth of the fish, thus a higher harvest during the correct seasons. An additional method, known sometimes as sea ranching, has also been used within the industry. Sea ranching involves raising fish in a hatchery for a brief time and then releasing them into marine waters for further development, whereupon the fish are recaptured when they have matured.
Crustaceans. Commercial shrimp farming began in the 1970s, and production grew steeply thereafter. Global production reached more than 1.6 million tonnes in 2003, worth about US$9 billion. About 75% of farmed shrimp is produced in Asia, in particular in China and Thailand. The other 25% is produced mainly in Latin America, where Brazil is the largest producer. Thailand is the largest exporter. Shrimp farming has changed from its traditional, small-scale form in Southeast Asia into a global industry. Technological advances have led to ever higher densities per unit area, and broodstock is shipped worldwide. Virtually all farmed shrimp are penaeids (i.e., shrimp of the family Penaeidae), and just two species of shrimp, the Pacific white shrimp and the giant tiger prawn, account for about 80% of all farmed shrimp. These industrial monocultures are very susceptible to disease, which has decimated shrimp populations across entire regions. Increasing ecological problems, repeated disease outbreaks, and pressure and criticism from both nongovernmental organizations and consumer countries led to changes in the industry in the late 1990s and generally stronger regulations. In 1999, governments, industry representatives, and environmental organizations initiated a program aimed at developing and promoting more sustainable farming practices through the Seafood Watch program.
Freshwater prawn farming shares many characteristics with, including many problems with, marine shrimp farming. Unique problems are introduced by the developmental lifecycle of the main species, the giant river prawn. The global annual production of freshwater prawns (excluding crayfish and crabs) in 2007 was about 460,000 tonnes, exceeding 1.86 billion dollars. Additionally, China produced about 370,000 tonnes of Chinese river crab. In addition astaciculture is the freshwater farming of crayfish (mostly in the US, Australia, and Europe). Molluscs. Aquacultured shellfish include various oyster, mussel, and clam species. These bivalves are filter and/or deposit feeders, which rely on ambient primary production rather than inputs of fish or other feed. As such, shellfish aquaculture is generally perceived as benign or even beneficial. Depending on the species and local conditions, bivalve molluscs are either grown on the beach, on longlines, or suspended from rafts and harvested by hand or by dredging. In May 2017 a Belgian consortium installed the first of two trial mussel farms on a wind farm in the North Sea.
Abalone farming began in the late 1950s and early 1960s in Japan and China. Since the mid-1990s, this industry has become increasingly successful. Overfishing and poaching have reduced wild populations to the extent that farmed abalone now supplies most abalone meat. Sustainably farmed molluscs can be certified by Seafood Watch and other organizations, including the World Wildlife Fund (WWF). WWF initiated the "Aquaculture Dialogues" in 2004 to develop measurable and performance-based standards for responsibly farmed seafood. In 2009, WWF co-founded the Aquaculture Stewardship Council with the Dutch Sustainable Trade Initiative to manage the global standards and certification programs. After trials in 2012, a commercial "sea ranch" was set up in Flinders Bay, Western Australia, to raise abalone. The ranch is based on an artificial reef made up of 5000 () separate concrete units called "abitats" (abalone habitats). The 900 kg abitats can host 400 abalone each. The reef is seeded with young abalone from an onshore hatchery. The abalone feed on seaweed that has grown naturally on the habitats, with the ecosystem enrichment of the bay also resulting in growing numbers of dhufish, pink snapper, wrasse, and Samson fish, among other species.
Brad Adams, from the company, has emphasised the similarity to wild abalone and the difference from shore-based aquaculture. "We're not aquaculture, we're ranching, because once they're in the water they look after themselves." Other groups. Other groups include aquatic reptiles, amphibians, and miscellaneous invertebrates, such as echinoderms and jellyfish. They are separately graphed at the top right of this section, since they do not contribute enough volume to show clearly on the main graph. Commercially harvested echinoderms include sea cucumbers and sea urchins. In China, sea cucumbers are farmed in artificial ponds as large as . Global fish production. Global fish production peaked at about 171 million tonnes in 2016, with aquaculture representing 47 percent of the total and 53 percent if non-food uses (including reduction to fishmeal and fish oil) are excluded. With capture fishery production relatively static since the late 1980s, aquaculture has been responsible for the continuing growth in the supply of fish for human consumption. Global aquaculture production (including aquatic plants) in 2016 was 110.2 million tonnes, with the first-sale value estimated at US$244 billion. Three years later, in 2019 the reported output from global aquaculture operations was over 120 million tonnes valued at US$274 billion and by 2022 it had reached 130.9 million tonnes, valued at USD 312.8 billion. For the first time, aquaculture surpassed capture fisheries in aquatic animal production with 94.4 million tonnes, representing 51 percent of the world total and a record 57 percent of the production destined for human consumption.
In 2022 most aquaculture workers were in Asia (95%), followed by Africa (3%) and Latin America and the Caribbean (2%). The contribution of aquaculture to the global production of capture fisheries and aquaculture combined has risen continuously, reaching 46.8 percent in 2016, up from 25.7 percent in 2000. With 5.8 percent annual growth rate during the period 2001–2016, aquaculture continues to grow faster than other major food production sectors, but it no longer has the high annual growth rates experienced in the 1980s and 1990s. In 2012, the total world production of fisheries was 158 million tonnes, of which aquaculture contributed 66.6 million tonnes, about 42%. The growth rate of worldwide aquaculture has been sustained and rapid, averaging about 8% per year for over 30 years, while the take from wild fisheries has been essentially flat for the last decade. The aquaculture market reached $86 billion in 2009. Aquaculture is an especially important economic activity in China. Between 1980 and 1997, the Chinese Bureau of Fisheries reports, aquaculture harvests grew at an annual rate of 16.7%, jumping from 1.9 million tonnes to nearly 23 million tonnes. In 2005, China accounted for 70% of world production. Aquaculture is also currently one of the fastest-growing areas of food production in the U.S.
About 90% of all U.S. shrimp consumption is farmed and imported. In recent years, salmon aquaculture has become a major export in southern Chile, especially in Puerto Montt, Chile's fastest-growing city. A United Nations report titled "The State of the World Fisheries and Aquaculture" released in May 2014 maintained fisheries and aquaculture support the livelihoods of some 60 million people in Asia and Africa. FAO estimates that in 2016, overall, women accounted for nearly 14 percent of all people directly engaged in the fisheries and aquaculture primary sector. In 2021, global fish production reached 182 million tonnes, with approximately equal amounts coming from capture (91.2 million tonnes) and aquaculture (90.9 million tonnes). Aquaculture has experienced rapid growth in recent decades, increasing almost sevenfold from 1990 to 2021. Over-reporting by China. China overwhelmingly dominates the world in reported aquaculture output, reporting a total output which is double that of the rest of the world put together. However, there are some historical issues with the accuracy of China's returns.
In 2001, scientists Reg Watson and Daniel Pauly expressed concerns that China was over reporting its catch from wild fisheries in the 1990s. They said that made it appear that the global catch since 1988 was increasing annually by 300,000 tonnes, whereas it was really shrinking annually by 350,000 tonnes. Watson and Pauly suggested this may have been related to Chinese policies where state entities that monitored the economy were also tasked with increasing output. Also, until more recently, the promotion of Chinese officials was based on production increases from their own areas. China disputed this claim. The official Xinhua News Agency quoted Yang Jian, director general of the Agriculture Ministry's Bureau of Fisheries, as saying that China's figures were "basically correct". However, the FAO accepted there were issues with the reliability of China's statistical returns, and for a period treated data from China, including the aquaculture data, apart from the rest of the world. Aquacultural methods. Mariculture.
Mariculture is the cultivation of marine organisms in seawater, variously in sheltered coastal waters ("inshore"), open ocean ("offshore"), and on land ("onshore"). Farmed species include algae (from microalgae (such as phytoplankton) to macroalgae (such as seaweed); shellfish (such as shrimp), lobster, oysters), and clams, and marine finfish. Channel catfish ("Ictalurus punctatus"), hard clams ("Mercenaria mercenaria") and Atlantic salmon ("Salmo salar") are prominent in the U.S. mariculture. Mariculture may consist of raising the organisms on or in artificial enclosures such as in floating netted enclosures for salmon, and on racks or in floating cages for oysters. In the case of enclosed salmon, they are fed by the operators; oysters on racks filter feed on naturally available food. Abalone have been farmed on an artificial reef consuming seaweed which grows naturally on the reef units. Integrated. Integrated multi-trophic aquaculture (IMTA) is a practice in which the byproducts (wastes) from one species are recycled to become inputs (fertilizers, food) for another. Fed aquaculture (for example, fish, shrimp) is combined with inorganic extractive and organic extractive (for example, shellfish) aquaculture to create balanced systems for environmental sustainability (biomitigation), economic stability (product diversification and risk reduction) and social acceptability (better management practices).
"Multi-trophic" refers to the incorporation of species from different trophic or nutritional levels in the same system. This is one potential distinction from the age-old practice of aquatic polyculture, which could simply be the co-culture of different fish species from the same trophic level. In this case, these organisms may all share the same biological and chemical processes, with few synergistic benefits, which could potentially lead to significant shifts in the ecosystem. Some traditional polyculture systems may, in fact, incorporate a greater diversity of species, occupying several niches, as extensive cultures (low intensity, low management) within the same pond. A working IMTA system can result in greater total production based on mutual benefits to the co-cultured species and improved ecosystem health, even if the production of individual species is lower than in a monoculture over a short-term period. Sometimes the term "integrated aquaculture" is used to describe the integration of monocultures through water transfer. For all intents and purposes, however, the terms "IMTA" and "integrated aquaculture" differ only in their degree of descriptiveness. Aquaponics, fractionated aquaculture, integrated agriculture-aquaculture systems, integrated peri-urban-aquaculture systems, and integrated fisheries-aquaculture systems are other variations of the IMTA concept.
Netting materials. Various materials, including nylon, polyester, polypropylene, polyethylene, plastic-coated welded wire, rubber, patented rope products (Spectra, Thorn-D, Dyneema), galvanized steel and copper are used for netting in aquaculture fish enclosures around the world. All of these materials are selected for a variety of reasons, including design feasibility, material strength, cost, and corrosion resistance. Recently, copper alloys have become important netting materials in aquaculture because they are antimicrobial (i.e., they destroy bacteria, viruses, fungi, algae, and other microbes) and they therefore prevent biofouling (i.e., the undesirable accumulation, adhesion, and growth of microorganisms, plants, algae, tubeworms, barnacles, mollusks, and other organisms). By inhibiting microbial growth, copper alloy aquaculture cages avoid costly net changes that are necessary with other materials. The resistance of organism growth on copper alloy nets also provides a cleaner and healthier environment for farmed fish to grow and thrive.
Technology. Uncrewed vessels, like ROVs and AUVs, are now being used in aquaculture in various ways, such as site planning, cage or net inspection, environmental monitoring, disaster assessment, and risk reduction. The use of uncrewed vessels aims to increase safety, efficiency, and accuracy of aquaculture operations. Aquaculture is a multi-million-dollar business that relies on net and cage maintenance. Inspections used to be conducted by divers manually inspecting the nets, but uncrewed vessels are now being used to conduct faster and more efficient inspections. Biofloc technology is also used to simultaneously improve water quality and generate bacterial biomass as food for the cultured animals. Issues. If performed without consideration for potential local environmental impacts, aquaculture in inland waters can result in more environmental damage than wild fisheries, though with less waste produced per kg on a global scale. Local concerns with aquaculture in inland waters may include waste handling, side-effects of antibiotics, competition between farmed and wild animals, and the potential introduction of invasive plant and animal species, or foreign pathogens, particularly if unprocessed fish are used to feed more marketable carnivorous fish. If non-local live feeds are used, aquaculture may introduce exotic plants or animals with disastrous effects. Improvements in methods resulting from advances in research and the availability of commercial feeds has reduced some of these concerns since their greater prevalence in the 1990s and 2000s .
Fish waste is organic and composed of nutrients necessary in all components of aquatic food webs. In-ocean aquaculture often produces much higher than normal fish waste concentrations. The waste collects on the ocean bottom, damaging or eliminating bottom-dwelling life. Waste can also decrease dissolved oxygen levels in the water column, putting further pressure on wild animals. An alternative model to food being added to the ecosystem, is the installation of artificial reef structures to increase the habitat niches available, without the need to add any more than ambient feed and nutrient. This has been used in the "ranching" of abalone in Western Australia. Impacts on wild fish. Some carnivorous and omnivorous farmed fish species are fed wild forage fish. Although carnivorous farmed fish represented only 13 percent of aquaculture production by weight in 2000, they represented 34 percent of aquaculture production by value. Farming of carnivorous species like salmon and shrimp leads to a high demand for forage fish to match the nutrition they get in the wild. Fish do not actually produce omega-3 fatty acids, but instead accumulate them from either consuming microalgae that produce these fatty acids, as is the case with forage fish like herring and sardines, or, as is the case with fatty predatory fish, like salmon, by eating prey fish that have accumulated omega-3 fatty acids from microalgae. To satisfy this requirement, more than 50 percent of the world fish oil production is fed to farmed salmon.
Farmed salmon consume more wild fish than they generate as a final product, although the efficiency of production is improving. To produce one kilograms of farmed salmon, products from several kilograms of wild fish are fed to them – this can be described as the "fish-in-fish-out" (FIFO) ratio. In 1995, salmon had a FIFO ratio of 7.5 (meaning 7.5 kilograms of wild fish feed were required to produce one kilogram of salmon); by 2006 the ratio had fallen to 4.9. Additionally, a growing share of fish oil and fishmeal come from residues (byproducts of fish processing), rather than dedicated whole fish. In 2012, 34 percent of fish oil and 28 percent of fishmeal came from residues. However, fishmeal and oil from residues instead of whole fish have a different composition with more ash and less protein, which may limit its potential use for aquaculture. As the salmon farming industry expands, it requires more wild forage fish for feed, at a time when seventy-five percent of the world's monitored fisheries are already near to or have exceeded their maximum sustainable yield. The industrial-scale extraction of wild forage fish for salmon farming then impacts the survivability of the wild predator fish who rely on them for food. An important step in reducing the impact of aquaculture on wild fish is shifting carnivorous species to plant-based feeds. Salmon feeds, for example, have gone from containing only fishmeal and oil to containing 40 percent plant protein. The USDA has also experimented with using grain-based feeds for farmed trout. When properly formulated (and often mixed with fishmeal or oil), plant-based feeds can provide proper nutrition and similar growth rates in carnivorous farmed fish.
Another impact aquaculture production can have on wild fish is the risk of fish escaping from coastal pens, where they can interbreed with their wild counterparts, diluting wild genetic stocks. Escaped fish can become invasive, out-competing native species. Animal welfare. As with the farming of terrestrial animals, social attitudes influence the need for humane practices and regulations in farmed marine animals. Under the guidelines advised by the Farm Animal Welfare Council good animal welfare means both fitness and a sense of well-being in the animal's physical and mental state. This can be defined by the Five Freedoms: However, the controversial issue in aquaculture is whether fish and farmed marine invertebrates are actually sentient, or have the perception and awareness to experience suffering. Although no evidence of this has been found in marine invertebrates, recent studies conclude that fish do have the necessary receptors (nociceptors) to sense noxious stimuli and so are likely to experience states of pain, fear and stress. Consequently, welfare in aquaculture is directed at vertebrates, finfish in particular.
Common welfare concerns. Welfare in aquaculture can be impacted by a number of issues such as stocking densities, behavioural interactions, disease and parasitism. A major problem in determining the cause of impaired welfare is that these issues are often all interrelated and influence each other at different times. Optimal stocking density is often defined by the carrying capacity of the stocked environment and the amount of individual space needed by the fish, which is very species specific. Although behavioural interactions such as shoaling may mean that high stocking densities are beneficial to some species, in many cultured species high stocking densities may be of concern. Crowding can constrain normal swimming behaviour, as well as increase aggressive and competitive behaviours such as cannibalism, feed competition, territoriality and dominance/subordination hierarchies. This potentially increases the risk of tissue damage due to abrasion from fish-to-fish contact or fish-to-cage contact. Fish can suffer reductions in food intake and food conversion efficiency. In addition, high stocking densities can result in water flow being insufficient, creating inadequate oxygen supply and waste product removal. Dissolved oxygen is essential for fish respiration and concentrations below critical levels can induce stress and even lead to asphyxiation. Ammonia, a nitrogen excretion product, is highly toxic to fish at accumulated levels, particularly when oxygen concentrations are low.
Many of these interactions and effects cause stress in the fish, which can be a major factor in facilitating fish disease. For many parasites, infestation depends on the host's degree of mobility, the density of the host population and vulnerability of the host's defence system. Sea lice are the primary parasitic problem for finfish in aquaculture, high numbers causing widespread skin erosion and haemorrhaging, gill congestion, and increased mucus production. There are also a number of prominent viral and bacterial pathogens that can have severe effects on internal organs and nervous systems. Improving welfare. The key to improving welfare of marine cultured organisms is to reduce stress to a minimum, as prolonged or repeated stress can cause a range of adverse effects. Attempts to minimise stress can occur throughout the culture process. Understanding and providing required environmental enrichment can be vital for reducing stress and benefit aquaculture objects such as improved growth body condition and reduced damage from aggression. During grow-out it is important to keep stocking densities at appropriate levels specific to each species, as well as separating size classes and grading to reduce aggressive behavioural interactions. Keeping nets and cages clean can assist positive water flow to reduce the risk of water degradation.
Not surprisingly disease and parasitism can have a major effect on fish welfare and it is important for farmers not only to manage infected stock but also to apply disease prevention measures. However, prevention methods, such as vaccination, can also induce stress because of the extra handling and injection. Other methods include adding antibiotics to feed, adding chemicals into water for treatment baths and biological control, such as using cleaner wrasse to remove lice from farmed salmon. Many steps are involved in transport, including capture, food deprivation to reduce faecal contamination of transport water, transfer to transport vehicle via nets or pumps, plus transport and transfer to the delivery location. During transport water needs to be maintained to a high quality, with regulated temperature, sufficient oxygen and minimal waste products. In some cases anaesthetics may be used in small doses to calm fish before transport. Aquaculture is sometimes part of an environmental rehabilitation program or as an aid in conserving endangered species.
Coastal ecosystems. Aquaculture is becoming a significant threat to coastal ecosystems. About 20 percent of mangrove forests have been destroyed since 1980, partly due to shrimp farming. An extended cost–benefit analysis of the total economic value of shrimp aquaculture built on mangrove ecosystems found that the external costs were much higher than the external benefits. Over four decades, of Indonesian mangroves have been converted to shrimp farms. Most of these farms are abandoned within a decade because of the toxin build-up and nutrient loss. Pollution from sea cage aquaculture. Salmon farms are typically sited in pristine coastal ecosystems which they then pollute. A farm with 200,000 salmon discharges more fecal waste than a city of 60,000 people. This waste is discharged directly into the surrounding aquatic environment, untreated, often containing antibiotics and pesticides." There is also an accumulation of heavy metals on the benthos (seafloor) near the salmon farms, particularly copper and zinc. In 2016, mass fish kill events impacted salmon farmers along Chile's coast and the wider ecology. Increases in aquaculture production and its associated effluent were considered to be possible contributing factors to fish and molluscan mortality.
Sea cage aquaculture is responsible for nutrient enrichment of the waters in which they are established. This results from fish wastes and uneaten feed inputs. Elements of most concern are nitrogen and phosphorus which can promote algal growth, including harmful algal blooms which can be toxic to fish. Flushing times, current speeds, distance from the shore and water depth are important considerations when locating sea cages in order to minimize the impacts of nutrient enrichment on coastal ecosystems. The extent of the effects of pollution from sea-cage aquaculture varies depending on where the cages are located, which species are kept, how densely cages are stocked and what the fish are fed. Important species-specific variables include the species' food conversion ratio (FCR) and nitrogen retention. Freshwater ecosystems. Whole-lake experiments carried out at the Experimental Lakes Area in Ontario, Canada, have displayed the potential for cage aquaculture to source numerous changes in freshwater ecosystems. Following the initiation of an experimental rainbow trout cage farm in a small boreal lake, dramatic reductions in mysis concentrations associated with a decrease in dissolved oxygen were observed. Significant increases in ammonium and total phosphorus, a driver for eutrophication in freshwater systems, were measured in the hypolimnion of the lake. Annual phosphorus inputs from aquaculture waste exceeded that of natural inputs from atmospheric deposition and inflows, and phytoplankton biomass has had a fourfold annual increase following the initiation of the experimental farm.
Genetic modification. A type of salmon called the AquAdvantage salmon has been genetically modified for faster growth, although it has not been approved for commercial use, due to controversy. The altered salmon incorporates a growth hormone from a Chinook salmon that allows it to reach full size in 16–28 months, instead of the normal 36 months for Atlantic salmon, and while consuming 25 percent less feed. The U.S. Food and Drug Administration reviewed the AquAdvantage salmon in a draft environmental assessment and determined that it "would not have a significant impact (FONSI) on the U.S. environment." Fish diseases, parasites and vaccines. A major difficulty for aquaculture is the tendency towards monoculture and the associated risk of widespread disease. Aquaculture is also associated with environmental risks; for instance, shrimp farming has caused the destruction of important mangrove forests throughout southeast Asia. In the 1990s, disease wiped out China's farmed Farrer's scallop and white shrimp and required their replacement by other species.
Needs of the aquaculture sector in vaccines. Aquaculture has an average annual growth rate of 9.2%, however, the success and continued expansion of the fish farming sector is highly dependent on the control of fish pathogens including a wide range of viruses, bacteria, fungi, and parasites. In 2014, it was estimated that these parasites cost the global salmon farming industry up to 400 million Euros. This represents 6–10% of the production value of the affected countries, but it can go up to 20% (Fisheries and Oceans Canada, 2014). Since pathogens quickly spread within a population of cultured fish, their control is vital for the sector. Historically, the use of antibiotics was against bacterial epizootics but the production of animal proteins has to be sustainable, which means that preventive measures that are acceptable from a biological and environmental point of view should be used to keep disease problems in aquaculture at an acceptable level. So, this added to the efficiency of vaccines resulted in an immediate and permanent reduction in the use of antibiotics in the 90s. In the beginning, there were fish immersion vaccines efficient against the vibriosis but proved ineffective against the furunculosis, hence the arrival of injectable vaccines: first water-based and after oil-based, much more efficient (Sommerset, 2005).
Development of new vaccines. It is the important mortality in cages among farmed fish, the debates around DNA injection vaccines, although effective, their safety and their side effects but also societal expectations for cleaner fish and security, lead research on new vaccine vectors. Several initiatives are financed by the European Union to develop a rapid and cost-effective approach to using bacteria in feed to make vaccines, in particular thanks to lactic bacteria whose DNA is modified (Boudinot, 2006). In fact, vaccinating farmed fish by injection is time-consuming and costly, so vaccines can be administered orally or by immersion by being added to feed or directly into water. This allows vaccinating many individuals at the same time while limiting the associated handling and stress. Indeed, many tests are necessary because the antigens of the vaccines must be adapted to each species or not present a certain level of variability or they will not have any effect. For example, tests have been done with two species: "Lepeophtheirus salmonis" (from which the antigens were collected) and "Caligus rogercresseyi" (which was vaccinated with the antigens), although the homology between the two species is important, the level of variability made the protection ineffective (Fisheries and Oceans Canada, 2014).
Recent vaccines development in aquaculture. There are 24 vaccines available and one for lobsters. The first vaccine was used in the USA against enteric red mouth in 1976. However, there are 19 companies and some small stakeholders are producing vaccines for aquaculture nowadays. The novel approaches are a way forward to prevent the loss of 10% of aquaculture through disease. Genetically modified vaccines are not being used in the EU due to societal concerns and regulations. Meanwhile, DNA vaccines are now authorised in the EU. There are challenges in fish vaccine development, immune response due to lack of potent adjuvants. Scientists are considering microdose application in future. But there are also opportunities in aquaculture vaccinology due to the low cost of technology, regulations change and novel antigen expression and delivery systems. In Norway subunit vaccine (VP2 peptide) against infectious pancreatic necrosis is being used. In Canada, a licensed DNA vaccine against Infectious hematopoietic necrosis has been launched for industry use.
Fish have large mucosal surfaces, so the preferred route is immersion, intraperitoneal and oral respectively. Nanoparticles are in progress for delivery purposes. The common antibodies produced are IgM and IgT. Normally booster is not required in fish because more memory cells are produced in response to the booster rather than an increased level of antibodies. mRNA vaccines are alternative to DNA vaccines because they are more safe, stable, easily producible at a large scale and mass immunization potential. Recently these are used in cancer prevention and therapeutics. Studies in rabies has shown that efficacy depends on dose and route of administration. These are still in infancy. Economic gains. In 2014, the aquaculture produced fish overtook wild caught fish, in supply for human food. This means there is a huge demand for vaccines, in prevention of diseases. The reported annual loss fish, calculates to >10 billion USD. This is from approximately 10% of all fishes dying from infectious diseases. The high annual losses increases the demand for vaccines. Even though there are about 24 traditionally used vaccines, there is still demand for more vaccines. The breakthrough of DNA-vaccines has sunk the cost of vaccines.
The alternative to vaccines would be antibiotics and chemotherapy, which are more expensive and with bigger drawbacks. DNA-vaccines have become the most cost-efficient method of preventing infectious diseases. This bodes well for DNA-vaccines becoming the new standard both in fish vaccines, and in general vaccines. Salinization/acidification of soils. Sediment from abandoned aquaculture farms can remain hypersaline, acidic and eroded. This material can remain unusable for aquaculture purposes for long periods thereafter. Various chemical treatments, such as adding lime, can aggravate the problem by modify the physicochemical characteristics of the sediment. Plastic pollution. Aquaculture produces a range of marine debris, depending on the product and location. The most frequently documented type of plastic is expanded polystyrene (EPS), used extensively in floats and sea cage collars (MEPC 2020). Other common waste items include cage nets and plastic harvest bins. A review of aquaculture as a source of marine litter in the North, Baltic and Mediterranean Seas identified 64 different items, 19 of which were unique to aquaculture . Estimates of the amount of aquaculture waste entering the oceans vary widely, depending on the methodologies used. For example, in the European Economic Area loss estimates have varied from a low of 3,000 tonnes to 41,000 tonnes per year.
Ecological benefits. While some forms of aquaculture can be devastating to ecosystems, such as shrimp farming in mangroves, other forms can be beneficial. Shellfish aquaculture adds substantial filter feeding capacity to an environment which can significantly improve water quality. A single oyster can filter 15 gallons of water a day, removing microscopic algal cells. By removing these cells, shellfish are removing nitrogen and other nutrients from the system and either retaining it or releasing it as waste which sinks to the bottom. By harvesting these shellfish, the nitrogen they retained is completely removed from the system. Raising and harvesting kelp and other macroalgae directly remove nutrients such as nitrogen and phosphorus. Repackaging these nutrients can relieve eutrophic, or nutrient-rich, conditions known for their low dissolved oxygen which can decimate species diversity and abundance of marine life. Removing algal cells from the water also increases light penetration, allowing plants such as eelgrass to reestablish themselves and further increase oxygen levels.
Aquaculture in an area can provide for crucial ecological functions for the inhabitants. Shellfish beds or cages can provide habitat structure. This structure can be used as shelter by invertebrates, small fish or crustaceans to potentially increase their abundance and maintain biodiversity. Increased shelter raises stocks of prey fish and small crustaceans by increasing recruitment opportunities in turn providing more prey for higher trophic levels. One study estimated that 10 square meters of oyster reef could enhance an ecosystem's biomass by 2.57 kg Herbivore shellfish will also be preyed on. This moves energy directly from primary producers to higher trophic levels potentially skipping out on multiple energetically costly trophic jumps which would increase biomass in the ecosystem. Seaweed farming is a carbon negative crop, with a high potential for climate change mitigation. The IPCC Special Report on the Ocean and Cryosphere in a Changing Climate recommends "further research attention" as a mitigation tactic. Regenerative ocean farming is a polyculture farming system that grows a mix of seaweeds and shellfish while sequestering carbon, decreasing nitrogen in the water and increasing oxygen, helping to regenerate and restore local habitat like reef ecosystems.
Prospects. Global wild fisheries are in decline, with valuable habitat such as estuaries in critical condition. The aquaculture or farming of piscivorous fish, like salmon, does not help the problem because they need to eat products from other fish, such as fish meal and fish oil. Studies have shown that salmon farming has major negative impacts on wild salmon, as well as the forage fish that need to be caught to feed them. Fish that are higher on the food chain are less efficient sources of food energy. Apart from fish and shrimp, some aquaculture undertakings, such as seaweed and filter-feeding bivalve mollusks like oysters, clams, mussels and scallops, are relatively benign and even environmentally restorative. Filter-feeders filter pollutants as well as nutrients from the water, improving water quality. Seaweeds extract nutrients such as inorganic nitrogen and phosphorus directly from the water, and filter-feeding mollusks can extract nutrients as they feed on particulates, such as phytoplankton and detritus.
Some profitable aquaculture cooperatives promote sustainable practices. New methods lessen the risk of biological and chemical pollution through minimizing fish stress, fallowing netpens, and applying integrated pest management. Vaccines are being used more and more to reduce antibiotic use for disease control. Onshore recirculating aquaculture systems, facilities using polyculture techniques, and properly sited facilities (for example, offshore areas with strong currents) are examples of ways to manage negative environmental effects. Recirculating aquaculture systems (RAS) recycle water by circulating it through filters to remove fish waste and food and then recirculating it back into the tanks. This saves water and the waste gathered can be used in compost or, in some cases, could even be treated and used on land. While RAS was developed with freshwater fish in mind, scientists associated with the Agricultural Research Service have found a way to rear saltwater fish using RAS in low-salinity waters. Although saltwater fish are raised in off-shore cages or caught with nets in water that typically has a salinity of 35 parts per thousand (ppt), scientists were able to produce healthy pompano, a saltwater fish, in tanks with a salinity of only 5 ppt. Commercializing low-salinity RAS are predicted to have positive environmental and economical effects. Unwanted nutrients from the fish food would not be added to the ocean and the risk of transmitting diseases between wild and farm-raised fish would greatly be reduced. The price of expensive saltwater fish, such as the pompano and cobia used in the experiments, would be reduced. However, before any of this can be done researchers must study every aspect of the fish's lifecycle, including the amount of ammonia and nitrate the fish will tolerate in the water, what to feed the fish during each stage of its lifecycle, the stocking rate that will produce the healthiest fish, etc.
Some 16 countries now use geothermal energy for aquaculture, including China, Israel, and the United States. In California, for example, 15 fish farms produce tilapia, bass, and catfish with warm water from underground. This warmer water enables fish to grow all year round and mature more quickly. Collectively these California farms produce 4.5 million kilograms of fish each year. Global goals. The UN Sustainable Development Goal 14 ("life below water"), Target 14.7 includes aquaculture: "By 2030, increase the economic benefits to small island developing states and least developed countries from the sustainable use of marine resources, including through sustainable management of fisheries, aquaculture and tourism". Aquaculture's contribution to GDP is not included in SDG Target 14.7 but methods for quantifying this have been explored by FAO. National laws, regulations, and management. Laws governing aquaculture practices vary greatly by country and are often not closely regulated or easily traceable. In the United States, land-based and nearshore aquaculture is regulated at the federal and state levels; however, no national laws govern offshore aquaculture in U.S. exclusive economic zone waters. In June 2011, the Department of Commerce and National Oceanic and Atmospheric Administration released national aquaculture policies to address this issue and "to meet the growing demand for healthy seafood, to create jobs in coastal communities, and restore vital ecosystems." Large aquaculture facilities (i.e. those producing per year) which discharge wastewater are required to obtain permits pursuant to the Clean Water Act. Facilities that produce at least of fish, molluscs or crustaceans a year are subject to specific national discharge standards. Other permitted facilities are subject to effluent limitations that are developed on a case-by-case basis.
By country. Aquaculture by Country: History. The Gunditjmara, a local Aboriginal Australian people in south-western Victoria, Australia, may have raised short-finned eels as early as about 4,580 BCE. Evidence indicates they developed about of volcanic floodplains in the vicinity of Lake Condah into a complex of channels and dams, and used woven traps to capture eels, and to preserve them to eat all year round. The local Budj Bim Cultural Landscape, a World Heritage Site, is one of the oldest known aquaculture sites in the world. Oral tradition in China tells of the culture of the common carp, "Cyprinus carpio", as long ago as 2000–2100 BCE (around 4,000 years BP), but the earliest significant evidence lies in the literature, in the earliest monograph on fish culture called "The Classic of Fish Culture", by Fan Li, written around 475 BCE ( BP). Another ancient Chinese guide to aquaculture , wriiten by Yang Yu Jing around 460 BCE, shows that carp farming was becoming more sophisticated. The Jiahu site in China has circumstantial archeological evidence as possibly the oldest aquaculture locations, dating from 6200BCE (about 8,200 years BP), but this is speculative. When the waters subsided after river floods, some fish, mainly carp, were trapped in lakes. Early aquaculturists fed their brood using nymphs and silkworm faeces, and ate them.
Ancient Egyptians might have farmed fish (especially gilt-head bream) from Lake Bardawil about 1,500 BCE (about 3,500 BP), and they traded them with Canaan. "Gim" cultivation is the oldest aquaculture in Korea. Early cultivation methods used bamboo or oak sticks; newer methods utilizing nets replaced them in the 19th century. Floating rafts have been used for mass production since the 1920s. Japanese people cultivated seaweed by providing bamboo poles and, later, nets and oyster shells to serve as anchoring-surfaces for spores. Romans bred fish in ponds and farmed oysters in coastal lagoons before 100 CE. In medieval Europe, early Christian monasteries adopted Roman aquacultural practices. Aquaculture spread because people away from coasts and big rivers were otherwise dependant on fish which required salting in order to be preserved. Fish was an important food source in medieval Europe, when in average 150 days per year were days of fasting and abstinence, and meat was prohibited. Improvements in transportation during the 19th century made fresh fish easily available and inexpensive, even in inland areas, rendering aquaculture less popular. The 15th-century fishponds of the Trebon Basin in the present-day Czech Republic are maintained as a tentative UNESCO World Heritage Site.
Samoans practised "a traditional form of giant clam ranching". Hawaiians constructed oceanic fish ponds. A remarkable example is the "Menehune" fishpond dating from at least 1,000 years ago, at Alekoko. Legend records its construction by the mythical Menehune dwarf-people. In the first half of the 18th century, German experimented with external fertilization of brown trout and salmon. He wrote an article "" ("On the Artificial Production of Trout and Salmon") summarizing his findings, and earning him a reputation as the founder of artificial fish-rearing. By the latter decades of the 18th century, oyster-farming had begun in estuaries along the Atlantic Coast of North America. The word "aquaculture" appeared in an 1855 newspaper article in reference to the harvesting of ice. It also appeared in descriptions of the terrestrial agricultural practise of sub-irrigation in the late-19th century before becoming associated primarily with the cultivation of aquatic plant- and animal-species. (The Oxford English Dictionary records the common modern usage of "aquaculture" from 1887;
and that of "aquiculture" from 1867.) In 1859, Stephen Ainsworth of West Bloomfield, New York, began experiments with brook trout. By 1864, Seth Green had established a commercial fish-hatching operation at Caledonia Springs, near Rochester, New York. By 1866, with the involvement of W. W. Fletcher of Concord, Massachusetts, artificial fish-hatcheries operated both in both Canada and in the United States. When the Dildo Island fish hatchery opened in Newfoundland in 1889, it was the largest and most advanced in the world. The word "aquaculture" was used in descriptions of the hatcheries experiments with cod and lobster in 1890. By the 1920s, the American Fish Culture Company of Carolina, Rhode Island, founded in the 1870s, was one of the leading producers of trout. During the 1940s, they perfected the method of manipulating the day- and night-cycle of fish so that they could be artificially spawned year-round. Californians harvested wild kelp and attempted to manage supply around 1900, later labeling it a wartime resource.
Kolmogorov complexity In algorithmic information theory (a subfield of computer science and mathematics), the Kolmogorov complexity of an object, such as a piece of text, is the length of a shortest computer program (in a predetermined programming language) that produces the object as output. It is a measure of the computational resources needed to specify the object, and is also known as algorithmic complexity, Solomonoff–Kolmogorov–Chaitin complexity, program-size complexity, descriptive complexity, or algorithmic entropy. It is named after Andrey Kolmogorov, who first published on the subject in 1963 and is a generalization of classical information theory. The notion of Kolmogorov complexity can be used to state and prove impossibility results akin to Cantor's diagonal argument, Gödel's incompleteness theorem, and Turing's halting problem. In particular, no program "P" computing a lower bound for each text's Kolmogorov complexity can return a value essentially larger than "P"'s own length (see section ); hence no single program can compute the exact Kolmogorov complexity for infinitely many texts. Kolmogorov complexity is the length of the ultimately compressed version of a file (i.e., anything which can be put in a computer). Formally, it is the length of a shortest program from which the file can be reconstructed. While Kolmogorov complexity is uncomputable, various approaches have been proposed and reviewed.
Definition. Intuition. Consider the following two strings of 32 lowercase letters and digits: The first string has a short English-language description, namely "write ab 16 times", which consists of 17 characters. The second one has no obvious simple description (using the same character set) other than writing down the string itself, i.e., "write 4c1j5b2p0cv4w1x8rx2y39umgw5q85s7" which has 38 characters. Hence the operation of writing the first string can be said to have "less complexity" than writing the second. More formally, the complexity of a string is the length of the shortest possible description of the string in some fixed universal description language (the sensitivity of complexity relative to the choice of description language is discussed below). It can be shown that the Kolmogorov complexity of any string cannot be more than a few bytes larger than the length of the string itself. Strings like the "abab" example above, whose Kolmogorov complexity is small relative to the string's size, are not considered to be complex.
The Kolmogorov complexity can be defined for any mathematical object, but for simplicity the scope of this article is restricted to strings. We must first specify a description language for strings. Such a description language can be based on any computer programming language, such as Lisp, Pascal, or Java. If P is a program which outputs a string "x", then P is a description of "x". The length of the description is just the length of P as a character string, multiplied by the number of bits in a character (e.g., 7 for ASCII). We could, alternatively, choose an encoding for Turing machines, where an "encoding" is a function which associates to each Turing Machine M a bitstring <M>. If M is a Turing Machine which, on input "w", outputs string "x", then the concatenated string <M> "w" is a description of "x". For theoretical analysis, this approach is more suited for constructing detailed formal proofs and is generally preferred in the research literature. In this article, an informal approach is discussed.
Any string "s" has at least one description. For example, the second string above is output by the pseudo-code: function GenerateString2() return "4c1j5b2p0cv4w1x8rx2y39umgw5q85s7" whereas the first string is output by the (much shorter) pseudo-code: function GenerateString1() return "ab" × 16 If a description "d"("s") of a string "s" is of minimal length (i.e., using the fewest bits), it is called a minimal description of "s", and the length of "d"("s") (i.e. the number of bits in the minimal description) is the Kolmogorov complexity of "s", written "K"("s"). Symbolically, The length of the shortest description will depend on the choice of description language; but the effect of changing languages is bounded (a result called the "invariance theorem"). Plain Kolmogorov complexity "C". There are two definitions of Kolmogorov complexity: "plain" and "prefix-free". The plain complexity is the minimal description length of any program, and denoted formula_1 while the prefix-free complexity is the minimal description length of any program encoded in a prefix-free code, and denoted formula_2. The plain complexity is more intuitive, but the prefix-free complexity is easier to study.
By default, all equations hold only up to an additive constant. For example, formula_3 really means that formula_4, that is, formula_5. Let formula_6 be a computable function mapping finite binary strings to binary strings. It is a universal function if, and only if, for any computable formula_7, we can encode the function in a "program" formula_8, such that formula_9. We can think of formula_10 as a program interpreter, which takes in an initial segment describing the program, followed by data that the program should process. One problem with plain complexity is that formula_11, because intuitively speaking, there is no general way to tell where to divide an output string just by looking at the concatenated string. We can divide it by specifying the length of formula_12 or formula_13, but that would take formula_14 extra symbols. Indeed, for any formula_15 there exists formula_16 such that formula_17. Typically, inequalities with plain complexity have a term like formula_14 on one side, whereas the same inequalities with prefix-free complexity have only formula_19.
The main problem with plain complexity is that there is something extra sneaked into a program. A program not only represents for something with its code, but also represents its own length. In particular, a program formula_12 may represent a binary number up to formula_21, simply by its own length. Stated in another way, it is as if we are using a termination symbol to denote where a word ends, and so we are not using 2 symbols, but 3. To fix this defect, we introduce the prefix-free Kolmogorov complexity. Prefix-free Kolmogorov complexity "K". A prefix-free code is a subset of formula_22 such that given any two different words formula_16 in the set, neither is a prefix of the other. The benefit of a prefix-free code is that we can build a machine that reads words from the code forward in one direction, and as soon as it reads the last symbol of the word, it "knows" that the word is finished, and does not need to backtrack or a termination symbol. Define a prefix-free Turing machine to be a Turing machine that comes with a prefix-free code, such that the Turing machine can read any string from the code in one direction, and stop reading as soon as it reads the last symbol. Afterwards, it may compute on a work tape and write to a write tape, but it cannot move its read-head anymore.
This gives us the following formal way to describe "K". Note that some universal Turing machines may not be programmable with prefix codes. We must pick only a prefix-free universal Turing machine. The prefix-free complexity of a string formula_12 is the shortest prefix code that makes the machine output formula_12:formula_28 holds for almost all formula_12. It can be shown that for the output of Markov information sources, Kolmogorov complexity is related to the entropy of the information source. More precisely, the Kolmogorov complexity of the output of a Markov information source, normalized by the length of the output, converges almost surely (as the length of the output goes to infinity) to the entropy of the source. Theorem. (Theorem 14.2.5 ) The conditional Kolmogorov complexity of a binary string formula_30 satisfiesformula_31where formula_32 is the binary entropy function (not to be confused with the entropy rate). Halting problem. The Kolmogorov complexity function is equivalent to deciding the halting problem.
If we have a halting oracle, then the Kolmogorov complexity of a string can be computed by simply trying every halting program, in lexicographic order, until one of them outputs the string. The other direction is much more involved. It shows that given a Kolmogorov complexity function, we can construct a function formula_33, such that formula_34 for all large formula_35, where formula_36 is the Busy Beaver shift function (also denoted as formula_37). By modifying the function at lower values of formula_35 we get an upper bound on formula_36, which solves the halting problem. Consider this program formula_40, which takes input as formula_41, and uses formula_42. We prove by contradiction that formula_49 for all large formula_41. Let formula_51 be a Busy Beaver of length formula_35. Consider this (prefix-free) program, which takes no input: Let the string output by the program be formula_44. The program has length formula_58, where formula_35 comes from the length of the Busy Beaver formula_51, formula_61 comes from using the (prefix-free) Elias delta code for the number formula_35, and formula_19 comes from the rest of the program. Therefore,formula_64for all big formula_41. Further, since there are only so many possible programs with length formula_55, we have formula_67 by pigeonhole principle.
By assumption, formula_68, so every string of length formula_43 has a minimal program with runtime formula_70. Thus, the string formula_44 has a minimal program with runtime formula_70. Further, that program has length formula_73. This contradicts how formula_44 was constructed. Universal probability. Fix a universal Turing machine formula_10, the same one used to define the (prefix-free) Kolmogorov complexity. Define the (prefix-free) universal probability of a string formula_12 to beformula_77In other words, it is the probability that, given a uniformly random binary stream as input, the universal Turing machine would halt after reading a certain prefix of the stream, and output formula_12. Note. formula_79 does not mean that the input stream is formula_80, but that the universal Turing machine would halt at some point after reading the initial segment formula_33, without reading any further input, and that, when it halts, its has written formula_12 to the output tape. Theorem. (Theorem 14.11.1) formula_83
Conditional versions. The conditional Kolmogorov complexity of two strings formula_84 is, roughly speaking, defined as the Kolmogorov complexity of "x" given "y" as an auxiliary input to the procedure. There is also a length-conditional complexity formula_85, which is the complexity of "x" given the length of "x" as known/input. Time-bounded complexity. Time-bounded Kolmogorov complexity is a modified version of Kolmogorov complexity where the space of programs to be searched for a solution is confined to only programs that can run within some pre-defined number of steps. It is hypothesised that the possibility of the existence of an efficient algorithm for determining approximate time-bounded Kolmogorov complexity is related to the question of whether true one-way functions exist.
Hymn to Proserpine “Hymn to Proserpine” is a poem by Algernon Charles Swinburne, published in "Poems and Ballads" in 1866. The poem is addressed to the goddess Proserpina, the Roman equivalent of Persephone, but laments the rise of Christianity for displacing the pagan goddess and her pantheon. The epigraph at the beginning of the poem is the phrase "Vicisti, Galilaee", Latin for "You have conquered, O Galilean", the supposed of the Emperor Julian. He had tried to reverse the official endorsement of Christianity by the Roman Empire. The poem is cast in the form of a lament by a person professing the paganism of classical antiquity and lamenting its passing, and expresses regret at the rise of Christianity. The line "Time and the Gods are at strife" inspired the title of Lord Dunsany's "Time and the Gods". The poem is quoted by Sue Bridehead in Thomas Hardy's 1895 novel, "Jude the Obscure" and also by Edward Ashburnham in Ford Madox Ford's "The Good Soldier".
The Triumph of Time "The Triumph of Time" is a poem by Algernon Charles Swinburne, published in "Poems and Ballads" in 1866. It is in adapted ottava rima and is full of elaborate use of literary devices, particularly alliteration. The theme, which purports to be autobiographical, is that of rejected love. The speaker deplores the ruin of his life, and in tones at times reminiscent of "Hamlet", craves oblivion, for which the sea serves as a constant metaphor.
Alfred the Great Alfred the Great ( ; – 26 October 899) was King of the West Saxons from 871 to 886, and King of the Anglo-Saxons from 886 until his death in 899. He was the youngest son of King Æthelwulf and his first wife Osburh, who both died when Alfred was young. Three of Alfred's brothers, Æthelbald, Æthelberht and Æthelred, reigned in turn before him. Under Alfred's rule, considerable administrative and military reforms were introduced, prompting lasting change in England. After ascending the throne, Alfred spent several years fighting Viking invasions. He won a decisive victory in the Battle of Edington in 878 and made an agreement with the Vikings, dividing England between Anglo-Saxon territory and the Viking-ruled Danelaw, composed of Scandinavian York, the north-east Midlands and East Anglia. Alfred also oversaw the conversion of Viking leader Guthrum to Christianity. He defended his kingdom against the Viking attempt at conquest, becoming the dominant ruler in England. Alfred began styling himself as "King of the Anglo-Saxons" after reoccupying London from the Vikings. Details of his life are described in a work by 9th-century Welsh scholar and bishop Asser.
Alfred had a reputation as a learned and merciful man of a gracious and level-headed nature who encouraged education, proposing that primary education be conducted in English rather than Latin, and improving the legal system and military structure and his people's quality of life. He was given the epithet "the Great" from as early as the 13th century, though it was only popularised from the 16th century. Alfred is the only native-born English monarch to be labelled as such. Family. Alfred was the youngest son of Æthelwulf, king of Wessex, and his wife Osburh. According to his biographer, Asser, writing in 893, "In the year of our Lord's Incarnation 849 Alfred, King of the Anglo-Saxons", was born at the royal estate called Wantage, in the district known as Berkshire ("which is so called from Berroc Wood, where the box tree grows very abundantly"). This date has been accepted by the editors of Asser's biography, Simon Keynes and Michael Lapidge, and by other historians such as David Dumville, Justin Pollard and Richard Huscroft. West Saxon genealogical lists state that Alfred was 23 when he became king in April 871, implying that he was born between April 847 and April 848. This dating is adopted in the biography of Alfred by Alfred Smyth, who regards Asser's biography as fraudulent, an allegation which is rejected by other historians. Richard Abels in his biography discusses both sources but does not decide between them and dates Alfred's birth as 847/849, while Patrick Wormald in his "Oxford Dictionary of National Biography" article dates it 848/849. Berkshire had been historically disputed between Wessex and the midland kingdom of Mercia, and as late as 844, a charter showed that it was part of Mercia, but Alfred's birth in the county is evidence that, by the late 840s, control had passed to Wessex.
He was the youngest of six children. His eldest brother, Æthelstan, was old enough to be appointed sub-king of Kent in 839, almost 10 years before Alfred was born. He died in the early 850s. Alfred's next three brothers were successively kings of Wessex. Æthelbald (858–860) and Æthelberht (860–865) were also much older than Alfred, but Æthelred (865–871) was only a year or two older. Alfred's only known sister, Æthelswith, married Burgred, king of Mercia in 853. Most historians think that Osburh was the mother of all Æthelwulf's children, but some suggest that the older ones were born to an unrecorded first wife. Osburh was descended from the rulers of the Isle of Wight. She was described by Asser as "a most religious woman, noble in character and noble by birth". She had died by 856 when Æthelwulf married Judith, daughter of Charles the Bald, king of West Francia. In 868, Alfred married Ealhswith, daughter of the Mercian nobleman Æthelred Mucel, ealdorman of the Gaini, and his wife Eadburh, who was of royal Mercian descent. Their children were Æthelflæd, who married Æthelred, Lord of the Mercians; Edward the Elder, Alfred's successor as king; Æthelgifu, abbess of Shaftesbury; Ælfthryth, who married Baldwin, count of Flanders; and Æthelweard.
Background. Alfred's grandfather, Ecgberht, became king of Wessex in 802, and in the view of the historian Richard Abels, it must have seemed very unlikely to contemporaries that he would establish a lasting dynasty. For 200 years, three families had fought for the West Saxon throne, and no son had followed his father as king. No ancestor of Ecgberht had been a king of Wessex since Ceawlin in the late sixth century, but he was believed to be a paternal descendant of Cerdic, the founder of the West Saxon dynasty. This made Ecgberht an ætheling – a prince eligible for the throne. But after Ecgberht's reign, descent from Cerdic was no longer sufficient to make a man an ætheling. When Ecgberht died in 839, he was succeeded by his son Æthelwulf; all subsequent West Saxon kings were descendants of Ecgberht and Æthelwulf, and were also sons of kings. At the beginning of the ninth century, England was almost wholly under the control of the Anglo-Saxons. Mercia dominated southern England, but its supremacy came to an end in 825 when it was decisively defeated by Ecgberht at the Battle of Ellendun. Mercia and Wessex became allies, which was important in the resistance to Viking attacks. In 853, King Burgred of Mercia requested West Saxon help to suppress a Welsh rebellion, and Æthelwulf led a West Saxon contingent in a successful joint campaign. In the same year Burgred married Æthelwulf's daughter, Æthelswith.
In 825, Ecgberht sent Æthelwulf to invade the Mercian sub-kingdom of Kent, and its sub-king, Baldred, was driven out shortly afterwards. By 830, Essex, Surrey and Sussex had submitted to Ecgberht, and he had appointed Æthelwulf to rule the south-eastern territories as king of Kent. The Vikings ravaged the Isle of Sheppey in 835, and the following year they defeated Ecgberht at Carhampton in Somerset, but in 838 he was victorious over an alliance of Cornishmen and Vikings at the Battle of Hingston Down, reducing Cornwall to the status of a client kingdom. When Æthelwulf succeeded to the throne, he appointed his eldest son Æthelstan as sub-king of Kent. Ecgberht and Æthelwulf may not have intended a permanent union between Wessex and Kent because they both appointed sons as sub-kings, and charters in Wessex were attested (witnessed) by West Saxon magnates, while Kentish charters were witnessed by the Kentish elite; both kings kept overall control, and the sub-kings were not allowed to issue their own coinage. Viking raids increased in the early 840s on both sides of the English Channel, and in 843 Æthelwulf was defeated at Carhampton. In 850, Æthelstan defeated a Danish fleet off Sandwich in the first recorded naval battle in English history. In 851, Æthelwulf and his second son, Æthelbald, defeated the Vikings at the Battle of Aclea and, according to the "Anglo-Saxon Chronicle", "there made the greatest slaughter of a heathen raiding-army that we have heard tell of up to this present day, and there took the victory". Æthelwulf died in 858 and was succeeded by his oldest surviving son, Æthelbald, as king of Wessex and by his next oldest son, Æthelberht, as king of Kent. Æthelbald only survived his father by two years, and Æthelberht then for the first time united Wessex and Kent into a single kingdom.
Childhood. According to Asser, in his childhood Alfred won a beautifully decorated book of English poetry, offered as a prize by his mother to the first of her sons able to memorise it. He must have had it read to him because his mother died when he was about six and he did not learn to read until he was 12. In 853, Alfred is reported by the "Anglo-Saxon Chronicle" to have been sent to Rome where he was confirmed by Pope Leo IV, who "anointed him as king". Victorian writers later interpreted this as an anticipatory coronation in preparation for his eventual succession to the throne of Wessex. This is unlikely; his succession could not have been foreseen at the time because Alfred had three living elder brothers. A letter of Leo IV shows that Alfred was made a "consul" and a misinterpretation of this investiture, deliberate or accidental, could explain later confusion. It may be based upon the fact that Alfred later accompanied his father on a pilgrimage to Rome where he spent some time at the court of Charles the Bald, king of the Franks, around 854–855. On their return from Rome in 856, Æthelwulf was deposed by his son Æthelbald. With civil war looming, the magnates of the realm met in council to form a compromise. Æthelbald retained the western shires (i.e. historical Wessex), and Æthelwulf ruled in the east. After King Æthelwulf died in 858, Wessex was ruled by three of Alfred's brothers in succession: Æthelbald, Æthelberht and Æthelred.
The reigns of Alfred's brothers. Alfred is not mentioned during the short reigns of his older brothers Æthelbald and Æthelberht. The "Anglo-Saxon Chronicle" describes the Great Heathen Army of Danes landing in East Anglia with the intent of conquering the four kingdoms which constituted Anglo-Saxon England in 865. Alfred's public life began in 865 at age 16 with the accession of his third brother, 18-year-old Æthelred. During this period, Bishop Asser gave Alfred the unique title of "secundarius", which may indicate a position similar to the Celtic tanist, a recognised successor closely associated with the reigning monarch. This arrangement may have been sanctioned by Alfred's father or by the Witan to guard against the danger of a disputed succession should Æthelred fall in battle. It was a well known tradition among other Germanic peoples – such as the Swedes and Franks to whom the Anglo-Saxons were closely related – to crown a successor as royal prince and military commander. Viking invasion. In 868, Alfred was recorded as fighting beside Æthelred in a failed attempt to keep the Great Heathen Army led by Ivar the Boneless out of the adjoining Kingdom of Mercia. The Danes arrived in his homeland at the end of 870, and nine engagements were fought in the following year, with mixed results; the places and dates of two of these battles have not been recorded. A successful skirmish at the Battle of Englefield in Berkshire on 31 December 870 was followed by a severe defeat at the siege and the Battle of Reading by Ivar's brother Halfdan Ragnarsson on 5 January 871. Four days later, the Anglo-Saxons won a victory at the Battle of Ashdown on the Berkshire Downs, possibly near Compton or Aldworth. The Saxons were defeated at the Battle of Basing on 22 January. They were defeated again on 22 March at the Battle of Merton (perhaps Marden in Wiltshire or Martin in Dorset). Æthelred died shortly afterwards in April 871.
King at war. Early struggles. In April 871, King Æthelred died and Alfred acceded to the throne of Wessex and the burden of its defence, even though Æthelred left two under-age sons, Æthelhelm and Æthelwold. This was in accordance with the agreement that Æthelred and Alfred had made earlier that year in an assembly at an unidentified place called Swinbeorg. The brothers had agreed that whichever of them outlived the other would inherit the personal property that King Æthelwulf had left jointly to his sons in his will. The deceased's sons would receive only whatever property and riches their father had settled upon them and whatever additional lands their uncle had acquired. The unstated premise was that the surviving brother would be king. Given the Danish invasion and the youth of his nephews, Alfred's accession probably went uncontested. While he was busy with the burial ceremonies for his brother, the Danes defeated the Saxon army in his absence at an unnamed spot and then again in his presence at Wilton in May. The defeat at Wilton smashed any remaining hope that Alfred could drive the invaders from his kingdom. Alfred was forced instead to make peace with them. Although the terms of the peace are not recorded, Bishop Asser wrote that the pagans agreed to vacate the realm and made good their promise.
The Viking army withdrew from Reading in the autumn of 871 to take up winter quarters in Mercian London. Although not mentioned by Asser or by the "Anglo-Saxon Chronicle", Alfred probably paid the Vikings silver to leave, much as the Mercians were to do in the following year. Hoards dating to the Viking occupation of London in 871/872 have been excavated at Croydon, Gravesend and Waterloo Bridge. These finds hint at the cost involved in making peace with the Vikings. For the next five years, the Danes occupied other parts of England. In 876, under Guthrum, Oscetel and Anwend, the Danes slipped past the Saxon army and attacked and occupied Wareham in Dorset. Alfred blockaded them but was unable to take Wareham by assault. He negotiated a peace that involved an exchange of hostages and oaths, which the Danes swore on a "holy ring" associated with the worship of Thor. The Danes broke their word, and after killing all the hostages, slipped away under cover of night to Exeter in Devon.
Legend of burnt cake. Having fled to the Somerset Levels, Alfred was purportedly given shelter by a peasant woman who, unaware of his identity, asked him to mind some wheaten cakes she left baking by the fire. Preoccupied with the problems of his kingdom, Alfred accidentally let the cakes burn, and was roundly scolded by the woman upon her return. The first written account of the legend appears a century after Alfred's death, though it may have earlier origins in folklore. Counter-attack and victory. In the seventh week after Easter (4–10 May 878), around Whitsuntide, Alfred rode to Egbert's Stone east of Selwood where he was met by "all the people of Somerset and of Wiltshire and of that part of Hampshire which is on this side of the sea (that is, west of Southampton Water), and they rejoiced to see him". Alfred's emergence from his marshland stronghold was part of a carefully planned offensive that entailed raising the fyrds of three shires. This meant not only that the king had retained the loyalty of ealdormen, royal reeves and king's thegns, who were charged with levying and leading these forces, but that they had maintained their positions of authority in these localities well enough to answer his summons to war. Alfred's actions also suggest a system of scouts and messengers.
Alfred won a decisive victory in the ensuing Battle of Edington which may have been fought near Westbury, Wiltshire. He then pursued the Danes to their stronghold at Chippenham and starved them into submission. One of the terms of the surrender was that Guthrum convert to Christianity. Three weeks later, the Danish king and 29 of his chief men were baptised at Alfred's court at Aller, near Athelney, with Alfred receiving Guthrum as his spiritual son. According to Asser, At Wedmore, Alfred and Guthrum negotiated what some historians have called the Treaty of Wedmore, but it was to be some years after the cessation of hostilities that a formal treaty was signed. Under the terms of the so-called Treaty of Wedmore, the converted Guthrum was required to leave Wessex and return to East Anglia. Consequently, in 879 the Viking army left Chippenham and made its way to Cirencester. The formal Treaty of Alfred and Guthrum, preserved in Old English in Corpus Christi College, Cambridge (Manuscript 383), and in a Latin compilation known as "Quadripartitus", was negotiated later, perhaps in 879 or 880, when King Ceolwulf II of Mercia was deposed.
That treaty divided up the kingdom of Mercia. By its terms, the boundary between Alfred's and Guthrum's kingdoms was to run up the River Thames to the River Lea, follow the Lea to its source (near Luton), from there extend in a straight line to Bedford, and from Bedford follow the River Ouse to Watling Street. Alfred succeeded to Ceolwulf's kingdom consisting of western Mercia, and Guthrum incorporated the eastern part of Mercia into an enlarged Kingdom of East Anglia (henceforward known as the Danelaw). By terms of the treaty, moreover, Alfred was to have control over the Mercian city of London and its mints—at least for the time being. In 825, the "Anglo-Saxon Chronicle" had recorded that the people of Essex, Sussex, Kent and Surrey surrendered to Egbert, Alfred's grandfather. From then until the arrival of the Great Heathen Army, Essex had formed part of Wessex. After the foundation of Danelaw, it appears that some of Essex would have been ceded to the Danes, but how much is not clear. 880s. With the signing of the Treaty of Alfred and Guthrum, an event most commonly held to have taken place around 880 when Guthrum's people began settling East Anglia, Guthrum was neutralised as a threat. The Viking army, which had stayed at Fulham during the winter of 878–879, sailed for Ghent and was active on the continent from 879 to 892.
There were local raids on the coast of Wessex throughout the 880s. In 882, Alfred fought a small sea battle against four Danish ships. Two of the ships were destroyed, and the others surrendered. This was one of four sea battles recorded in the "Anglo-Saxon Chronicle", three of which involved Alfred. Similar small skirmishes with independent Viking raiders would have occurred for much of the period as they had for decades. In 883, Pope Marinus exempted the Saxon quarter in Rome from taxation, probably in return for Alfred's promise to send alms annually to Rome, which may be the origin of the medieval tax called Peter's Pence. The pope sent gifts to Alfred, including what was reputed to be a piece of the True Cross. After the signing of the treaty with Guthrum, Alfred was spared any large-scale conflicts for some time. Despite this relative peace, the king was forced to deal with a number of Danish raids and incursions. Among these was a raid in Kent, an allied kingdom in South East England, during the year 885, which was possibly the largest raid since the battles with Guthrum. Asser's account of the raid places the Danish raiders at the Saxon city of Rochester, where they built a temporary fortress in order to besiege the city. In response to this incursion, Alfred led an Anglo-Saxon force against the Danes who, instead of engaging the army of Wessex, fled to their beached ships and sailed to another part of Britain. The retreating Danish force supposedly left Britain the following summer.
Not long after the failed Danish raid in Kent, Alfred dispatched his fleet to East Anglia. The purpose of this expedition is debated, but Asser claims that it was for the sake of plunder. After travelling up the River Stour, the fleet was met by Danish vessels that numbered 13 or 16 (sources vary on the number), and a battle ensued. The Anglo-Saxon fleet emerged victorious, and as Henry of Huntingdon writes, "laden with spoils". The victorious fleet was surprised when attempting to leave the River Stour and was attacked by a Danish force at the mouth of the river. The Danish fleet defeated Alfred's fleet, which may have been weakened in the previous engagement. King of the Anglo-Saxons. A year later, in 886, Alfred reoccupied the city of London and set out to make it habitable again. Alfred entrusted the city to the care of his son-in-law Æthelred, ealdorman of Mercia. Soon afterwards, Alfred restyled himself "King of the Anglo-Saxons". The restoration of London progressed through the latter half of the 880s and is believed to have revolved around a new street plan; added fortifications in addition to the existing Roman walls; and, some believe, the construction of matching fortifications on the south bank of the River Thames.
This is also the period in which almost all chroniclers agree that the Saxon people of pre-unification England submitted to Alfred. In 888, Æthelred, the archbishop of Canterbury, also died. One year later Guthrum, or Athelstan by his baptismal name, Alfred's former enemy and king of East Anglia, died and was buried in Hadleigh, Suffolk. Guthrum's death changed the political landscape for Alfred. The resulting power vacuum stirred other power-hungry warlords eager to take his place in the following years. Viking attacks (890s). After another lull, in the autumn of 892 or 893, the Danes attacked again. Finding their position in mainland Europe precarious, they crossed to England in 330 ships in two divisions. They entrenched themselves, the larger body at Appledore, Kent, and the lesser under Hastein, at Milton, also in Kent. The invaders brought their wives and children with them, indicating a meaningful attempt at conquest and colonisation. Alfred, in 893 or 894, took up a position from which he could observe both forces.
While he was in talks with Hastein, the Danes at Appledore broke out and struck north-westwards. They were overtaken by Alfred's eldest son Edward, and were defeated at the Battle of Farnham in Surrey. They took refuge on an island at Thorney, on the River Colne between Buckinghamshire and Middlesex, where they were blockaded and forced to give hostages and promise to leave Wessex. They then went to Essex and after suffering another defeat at Benfleet, joined with Hastein's force at Shoebury. Alfred had been on his way to relieve his son at Thorney when he heard that the Northumbrian and East Anglian Danes were besieging Exeter and an unnamed stronghold on the North Devon shore. Alfred at once hurried westward and raised the Siege of Exeter. The fate of the other place is not recorded. The force under Hastein set out to march up the Thames Valley, possibly with the idea of assisting their friends in the west. They were met by a large force under the three great ealdormen of Mercia, Wiltshire and Somerset and forced to head off to the north-west, being finally overtaken and blockaded at Buttington. (Some identify this with Buttington Tump at the mouth of the River Wye, others with Buttington near Welshpool.) An attempt to break through the English lines failed. Those who escaped retreated to Shoebury. After collecting reinforcements, they made a sudden dash across England and occupied the ruined Roman walls of Chester. The English did not attempt a winter blockade but contented themselves with destroying all the supplies in the district.
Early in 894 or 895 lack of food obliged the Danes to retire once more to Essex. At the end of the year, the Danes drew their ships up the River Thames and the River Lea and fortified themselves north of London. A frontal attack on the Danish lines failed but later in the year, Alfred saw a means of obstructing the river to prevent the egress of the Danish ships. The Danes realised that they were outmanoeuvred, struck off north-westwards and wintered at Cwatbridge near Bridgnorth. The next year, 896 (or 897), they gave up the struggle. Some retired to Northumbria, some to East Anglia. Those who had no connections in England returned to the continent. Military reorganisation. The Germanic tribes who invaded Britain in the fifth and sixth centuries relied upon the unarmoured infantry supplied by their tribal levy, or fyrd, and it was upon this system that the military power of the several kingdoms of early Anglo-Saxon England depended. The fyrd was a local militia in the Anglo-Saxon shire in which all freemen had to serve; those who refused military service were subject to fines or loss of their land. According to the law code of King Ine of Wessex, issued in :
Wessex's history of failures preceding Alfred's success in 878 emphasised to him that the traditional system of battle he had inherited played to the Danes' advantage. While the Anglo-Saxons and the Danes attacked settlements for plunder, they employed different tactics. In their raids the Anglo-Saxons traditionally preferred to attack head-on by assembling their forces in a shield wall, advancing against their target and overcoming the oncoming wall marshalled against them in defence. The Danes preferred to choose easy targets, mapping cautious forays to avoid risking their plunder with high-stake attacks for more. Alfred determined their tactic was to launch small attacks from a secure base to which they could retreat should their raiders meet strong resistance. The bases were prepared in advance, often by capturing an estate and augmenting its defences with ditches, ramparts and palisades. Once inside the fortification, Alfred realised, the Danes enjoyed the advantage, better situated to outlast their opponents or crush them with a counter-attack because the provisions and stamina of the besieging forces waned.
The means by which the Anglo-Saxons marshalled forces to defend against marauders also left them vulnerable to the Vikings. It was the responsibility of the shire fyrd to deal with local raids. The king could call up the national militia to defend the kingdom but in the case of the Viking raids, problems with communication and raising supplies meant that the national militia could not be mustered quickly enough. It was only after the raids had begun that a call went out to landowners to gather their men for battle. Large regions could be devastated before the fyrd could assemble and arrive. Although the landowners were obliged to the king to supply these men when called, during the attacks in 878 many of them abandoned their king and collaborated with Guthrum. With these lessons in mind Alfred capitalised on the relatively peaceful years following his victory at Edington with an ambitious restructuring of Saxon defences. On a trip to Rome Alfred had stayed with Charles the Bald, and it is possible that he may have studied how the Carolingian kings had dealt with Viking raiders. Learning from their experiences he was able to establish a system of taxation and defence for Wessex. There had been a system of fortifications in pre-Viking Mercia that may have been an influence. When the Viking raids resumed in 892 Alfred was better prepared to confront them with a standing, mobile field army, a network of garrisons and a small fleet of ships navigating the rivers and estuaries.
Administration and taxation. Tenants in Anglo-Saxon England had a threefold obligation based on their landholding: the so-called "common burdens" of military service, fortress work, and bridge repair. This threefold obligation has traditionally been called "trinoda necessitas" or "trimoda necessitas". The Old English name for the fine due for neglecting military service was . To maintain the burhs, and to reorganise the fyrd as a standing army, Alfred expanded the tax and conscription system based on the productivity of a tenant's landholding. The hide was the basic unit of the system on which the tenant's public obligations were assessed. A hide is thought to represent the amount of land required to support one family. The hide differed in size according to the value and resources of the land and the landowner would have to provide service based on how many hides he owned. Burghal system. The foundation of Alfred's new military defence system was a network of burhs, distributed at tactical points throughout the kingdom. There were thirty-three burhs, about apart, enabling the military to confront attacks anywhere in the kingdom within a day.
Alfred's burhs (of which 22 developed into boroughs) ranged from former Roman towns, such as Winchester, where the stone walls were repaired and ditches added, to massive earthen walls surrounded by wide ditches, probably reinforced with wooden revetments and palisades, such as at Burpham in West Sussex. The size of the burhs ranged from tiny outposts such as Pilton in Devon, to large fortifications in established towns, the largest being at Winchester. A document now known as the "Burghal Hidage" provides an insight into how the system worked. It lists the hidage for each of the fortified towns contained in the document. Wallingford had a hidage of 2,400, which meant that the landowners there were responsible for supplying and feeding 2,400 men, the number sufficient for maintaining of wall. A total of 27,071 soldiers were needed, approximately one in four of all the free men in Wessex. Many of the burhs were twin towns that straddled a river and were connected by a fortified bridge, like those built by Charles the Bald a generation before. The double-burh blocked passage on the river, forcing Viking ships to navigate under a garrisoned bridge lined with men armed with stones, spears or arrows. Other burhs were sited near fortified royal villas, allowing the king better control over his strongholds.
The burhs were connected by a road system maintained for army use (known as herepaths). The roads allowed an army quickly to be assembled, sometimes from more than one burh, to confront the Viking invader. The road network posed significant obstacles to Viking invaders, especially those laden with booty. The system threatened Viking routes and communications making it far more dangerous for them. The Vikings lacked the equipment for a siege against a burh and a developed doctrine of siegecraft, having tailored their methods of fighting to rapid strikes and unimpeded retreats to well-defended fortifications. The only means left to them was to starve the burh into submission but this gave the king time to send his field army or garrisons from neighbouring burhs along the army roads. In such cases, the Vikings were extremely vulnerable to pursuit by the king's joint military forces. Alfred's burh system posed such a formidable challenge against Viking attack that when the Vikings returned in 892 and stormed a half-built, poorly garrisoned fortress up the Lympne estuary in Kent, the Anglo-Saxons were able to limit their penetration to the outer frontiers of Wessex and Mercia. Alfred's burghal system was revolutionary in its strategic conception and potentially expensive in its execution. His contemporary biographer Asser wrote that many nobles balked at the demands placed upon them even though they were for "the common needs of the kingdom".
English navy. Alfred also tried his hand at naval design. In 896 he ordered the construction of a small fleet, perhaps a dozen or so longships that, at 60 oars, were twice the size of Viking warships. This was not, as the Victorians asserted, the birth of the English Navy. Wessex had possessed a royal fleet before this. Alfred's older brother sub-king Æthelstan of Kent and Ealdorman Ealhhere had defeated a Viking fleet in 851 capturing nine ships and Alfred had conducted naval actions in 882. The year 897 marked an important development in the naval power of Wessex. The author of the "Anglo-Saxon Chronicle" related that Alfred's ships were larger, swifter, steadier and rode higher in the water than either Danish or Frisian ships. It is probable that, under the classical tutelage of Asser, Alfred used the design of Greek and Roman warships, with high sides, designed for fighting rather than for navigation. Alfred had seapower in mind; if he could intercept raiding fleets before they landed, he could spare his kingdom from being ravaged. Alfred's ships may have been superior in conception, but in practice they proved to be too large to manoeuvre well in the close waters of estuaries and rivers, the only places in which a naval battle could be fought. The warships of the time were not designed to be ship killers but rather troop carriers. It has been suggested that, like sea battles in late Viking age Scandinavia, these battles may have entailed a ship coming alongside an opposing vessel, lashing the two ships together and then boarding the craft. The result was a land battle involving hand-to-hand fighting on board the two lashed vessels.
In the one recorded naval engagement in 896, Alfred's new fleet of nine ships intercepted six Viking ships at the mouth of an unidentified river in the south of England. The Danes had beached half their ships and gone inland. Alfred's ships immediately moved to block their escape. The three Viking ships afloat attempted to break through the English lines. Only one made it; Alfred's ships intercepted the other two. Lashing the Viking boats to their own, the English crew boarded and proceeded to kill the Vikings. One ship escaped because Alfred's heavy ships became grounded when the tide went out. A land battle ensued between the crews. The Danes were heavily outnumbered, but as the tide rose, they returned to their boats which, with shallower drafts, were freed first. The English watched as the Vikings rowed past them but they suffered so many casualties (120 dead against 62 Frisians and English) that they had difficulty putting out to sea. All were too damaged to row around Sussex, and two were driven against the Sussex coast (possibly at Selsey Bill). The shipwrecked crew were brought before Alfred at Winchester and hanged.
Legal reform. In the late 880s or early 890s, Alfred issued a long "domboc" or law code consisting of his own laws, followed by a code issued by his late seventh-century predecessor King Ine of Wessex. Together these laws are arranged into 120 chapters. In his introduction Alfred explains that he gathered together the laws he found in many "synod-books" and "ordered to be written many of the ones that our forefathers observed—those that pleased me; and many of the ones that did not please me, I rejected with the advice of my councillors, and commanded them to be observed in a different way". Alfred singled out in particular the laws that he "found in the days of Ine, my kinsman, or Offa, king of the Mercians, or King Æthelberht of Kent who first among the English people received baptism". He appended, rather than integrated, the laws of Ine into his code and although he included, as had Æthelbert, a scale of payments in compensation for injuries to various body parts, the two injury tariffs are not aligned. Offa is not known to have issued a law code, leading historian Patrick Wormald to speculate that Alfred had in mind the legatine capitulary of 786 that was presented to Offa by the papal legate George of Ostia.
About a fifth of the law code is taken up by Alfred's introduction which includes translations into English of the Ten Commandments, a few chapters from the Book of Exodus, and the Apostolic Letter from the Acts of the Apostles (15:23–29). The introduction may best be understood as Alfred's meditation upon the meaning of Christian law. It traces the continuity between God's gift of law to Moses to Alfred's own issuance of law to the West Saxon people. By doing so, it linked the holy past to the historical present and represented Alfred's law-giving as a type of divine legislation. Similarly Alfred divided his code into 120 chapters because 120 was the age at which Moses died and, in the number-symbolism of early medieval biblical exegetes, 120 stood for law. The link between Mosaic law and Alfred's code is the Apostolic Letter which explained that Christ "had come not to shatter or annul the commandments but to fulfill them; and he taught mercy and meekness" (Intro, 49.1). The mercy that Christ infused into Mosaic law underlies the injury tariffs that figure so prominently in barbarian law codes since Christian synods "established, through that mercy which Christ taught, that for almost every misdeed at the first offence secular lords might with their permission receive without sin the monetary compensation which they then fixed".
The only crime that could not be compensated with a payment of money was treachery to a lord "since Almighty God adjudged none for those who despised Him, nor did Christ, the Son of God, adjudge any for the one who betrayed Him to death; and He commanded everyone to love his lord as Himself". Alfred's transformation of Christ's commandment, from "Love your neighbour as yourself" (Matt. 22:39–40) to love your secular lord as you would love the Lord Christ himself, underscores the importance that Alfred placed upon lordship which he understood as a sacred bond instituted by God for the governance of man. When one turns from the "domboc" introduction to the laws themselves, it is difficult to uncover any logical arrangement. The impression is of a hodgepodge of miscellaneous laws. The law code, as it has been preserved, is singularly unsuitable for use in lawsuits. In fact, several of Alfred's laws contradicted the laws of Ine that form an integral part of the code. Patrick Wormald's explanation is that Alfred's law code should be understood not as a legal manual but as an ideological manifesto of kingship "designed more for symbolic impact than for practical direction". In practical terms the most important law in the code may well have been the first: "We enjoin, what is most necessary, that each man keep carefully his oath and his pledge" which expresses a fundamental tenet of Anglo-Saxon law.
Alfred devoted considerable attention and thought to judicial matters. Asser underscores his concern for judicial fairness. Alfred, according to Asser, insisted upon reviewing contested judgments made by his ealdormen and reeves and "would carefully look into nearly all the judgements which were passed [issued] in his absence anywhere in the realm to see whether they were just or unjust". A charter from the reign of his son Edward the Elder depicts Alfred as hearing one such appeal in his chamber while washing his hands. Asser represents Alfred as a Solomonic judge, painstaking in his own judicial investigations and critical of royal officials who rendered unjust or unwise judgments. Although Asser never mentions Alfred's law code he does say that Alfred insisted that his judges be literate so that they could apply themselves "to the pursuit of wisdom". The failure to comply with this royal order was to be punished by loss of office. The "Anglo-Saxon Chronicle", commissioned at the time of Alfred, was probably written to promote unification of England, whereas Asser's "The Life of King Alfred" promoted Alfred's achievements and personal qualities. It was possible that the document was designed this way so that it could be disseminated in Wales because Alfred had acquired overlordship of that country.
Foreign relations. Asser speaks grandiosely of Alfred's relations with foreign powers but little definite information is available. His interest in foreign countries is shown by the insertions which he made in his translation of Orosius. He corresponded with Elias III, the patriarch of Jerusalem, and embassies to Rome conveying the English alms to the pope were fairly frequent. Around 890, Wulfstan of Hedeby undertook a journey from Hedeby on Jutland along the Baltic Sea to the Prussian trading town of Truso. Alfred personally collected details of this trip. Alfred's relations with the Celtic princes in the western half of Great Britain are clearer. Comparatively early in his reign, according to Asser, the southern Welsh princes, owing to the pressure on them from North Wales and Mercia, commended themselves to Alfred. Later in his reign, the North Welsh followed their example and the latter cooperated with the English in the campaign of 893 (or 894). That Alfred sent alms to Irish and Continental monasteries may be taken on Asser's authority. The visit of three pilgrim "Scots" ("i.e.", Irish) to Alfred in 891 is undoubtedly authentic. The story that, in his childhood, he was sent to Ireland to be healed by Saint Modwenna may show Alfred's interest in that island.
Religion, education and culture. In the 880s, at the same time that he was "cajoling and threatening" his nobles to build and man the burhs, Alfred, perhaps inspired by the example of Charlemagne almost a century before, undertook an equally ambitious effort to revive learning. During this period, the Viking raids were often seen as a divine punishment, and Alfred may have wished to revive religious awe in order to appease God's wrath. This revival entailed the recruitment of clerical scholars from Mercia, Wales and abroad to enhance the tenor of the court and of the episcopacy; the establishment of a court school to educate his own children, the sons of his nobles, and intellectually promising boys of lesser birth; an attempt to require literacy in those who held offices of authority; a series of translations into the vernacular of Latin works the king deemed "most necessary for all men to know"; the compilation of a chronicle detailing the rise of Alfred's kingdom and house, with a genealogy that stretched back to Adam, thus giving the West Saxon kings a biblical ancestry.
Very little is known of the church under Alfred. The Danish attacks had been particularly damaging to the monasteries. Although Alfred founded monasteries at Athelney and Shaftesbury, these were the first new monastic houses in Wessex since the beginning of the eighth century. According to Asser, Alfred enticed foreign monks to England for his monastery at Athelney because there was little interest for the locals to take up the monastic life. Alfred undertook no systematic reform of ecclesiastical institutions or religious practices in Wessex. For him, the key to the kingdom's spiritual revival was to appoint pious, learned, and trustworthy bishops and abbots. As king, he saw himself as responsible for both the temporal and spiritual welfare of his subjects. Secular and spiritual authority were not distinct categories for Alfred. He was equally comfortable distributing his translation of Gregory the Great's "Pastoral Care" to his bishops so that they might better train and supervise priests and using those same bishops as royal officials and judges. Nor did his piety prevent him from expropriating strategically sited church lands, especially estates along the border with the Danelaw, and transferring them to royal thegns and officials who could better defend them against Viking attacks.
Effect of Danish raids on education. The Danish raids had a devastating effect on learning in England. Alfred lamented in the preface to his translation of Gregory's "Pastoral Care" that "learning had declined so thoroughly in England that there were very few men on this side of the Humber who could understand their divine services in English or even translate a single letter from Latin into English: and I suppose that there were not many beyond the Humber either". Alfred undoubtedly exaggerated, for dramatic effect, the abysmal state of learning in England during his youth. That Latin learning had not been obliterated is evidenced by the presence in his court of learned Mercian and West Saxon clerics such as Plegmund, Wæferth, and Wulfsige. Manuscript production in England dropped off precipitously around the 860s when the Viking invasions began in earnest, not to be revived until the end of the century. Numerous Anglo-Saxon manuscripts burnt along with the churches that housed them. A solemn diploma from Christ Church, Canterbury, dated 873, is so poorly constructed and written that historian Nicholas Brooks posited a scribe who was either so blind he could not read what he wrote or who knew little or no Latin. "It is clear", Brooks concludes, "that the metropolitan church [of Canterbury] must have been quite unable to provide any effective training in the scriptures or in Christian worship".

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