Aquaculture: Difference between revisions
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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. |
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. |
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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. |
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. |
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=== Freshwater ecosystems === |
=== Freshwater ecosystems === |
Revision as of 20:00, 12 March 2021
Aquaculture (less commonly spelled aquiculture
According to the
Particular kinds of aquaculture include
History
The
Gim cultivation is the oldest aquaculture in Korea.[18] Early cultivation methods used bamboo or oak sticks,[18] which were replaced by newer methods that utilized nets in the 19th century.[18][19] Floating rafts have been used for mass production since the 1920s.[18]
Japanese cultivated seaweed by providing bamboo poles and, later, nets and oyster shells to serve as anchoring surfaces for spores.[20]
In central Europe, early Christian
In the first half of the 18th century, German Stephan Ludwig Jacobi experimented with external fertilization of brown trouts and salmon. He wrote an article "Von der künstlichen Erzeugung der Forellen und Lachse" (On the Artificial Production of Trout and Salmon) summarizing his findings, and is regarded as the founder of artificial fish rearing in Europe.[26] By the latter decades of the 18th century, oyster farming had begun in estuaries along the Atlantic Coast of North America.[27]
The word aquaculture appeared in an 1855 newspaper article in reference to the harvesting of ice.[28] It also appeared in descriptions of the terrestrial agricultural practise of sub-irrigation in the late 19th century[29] before becoming associated primarily with the cultivation of aquatic plant and animal species.
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 Dr. W. W. Fletcher of Concord, Massachusetts, artificial fish hatcheries were underway in both Canada and the United States.[30] 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.[31]
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 had perfected the method of manipulating the day and night cycle of fish so that they could be artificially spawned year around.[32]
Californians harvested wild kelp and attempted to manage supply around 1900, later labeling it a wartime resource.[33]
21st-century practice
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.[34][35] 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.[36] 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."[37]
About 430 (97%) of the species cultured as of 2007[update] 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.[38] 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,[39] 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. [citation needed][40]
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.[41] Models are being used to help with spatial planning and siting of fish farms in order to minimize impact.[42]
The decline in wild fish stocks has increased the demand for farmed fish.[43] 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.[44]
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.[45]
Species groups
Aquatic plants
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.[48]
Seaweed farming
Seaweed farming or kelp farming is the practice of cultivating and harvesting seaweed. In its simplest form farmers gather from natural beds, while at the other extreme farmers fully control the crop's life cycle.
The seven most cultivated
The largest seaweed-producing countries as of 2022 are China (58.62%) and Indonesia (28.6%); followed by South Korea (5.09%) and the Philippines (4.19%). Other notable producers include North Korea (1.6%), Japan (1.15%), Malaysia (0.53%), Zanzibar (Tanzania, 0.5%), and Chile (0.3%).[51][52] Seaweed farming has frequently been developed to improve economic conditions and to reduce fishing pressure.[53]
The Food and Agriculture Organization (FAO), reported that world production in 2019 was over 35 million tonnes. North America produced some 23,000 tonnes of wet seaweed. Alaska, Maine, France, and Norway each more than doubled their seaweed production since 2018. As of 2019, seaweed represented 30% of marine aquaculture.[54]
Seaweed farming is aFish
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.[46]
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)[58] where they are further grown for the market.[59] 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.[60][61] 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.[62]
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
The global annual production of freshwater prawns (excluding
In addition astaciculture is the freshwater farming of crayfish (mostly in the US, Australia, and Europe).[67]
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.[68]
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.[69]
After trials in 2012,[73] 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 (As of April 2016[update]) 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."[74][75]
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.[citation needed]
Commercially harvested echinoderms include sea cucumbers and sea urchins. In China, sea cucumbers are farmed in artificial ponds as large as 1,000 acres (400 ha).[76]
Around the world
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.[48] Global aquaculture production (including aquatic plants) in 2016 was 110.2 million tonnes, with the first-sale value estimated at US$243.5 billion. 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.[48]
In 2012, the total world production of fisheries was 158 million tonnes, of which aquaculture contributed 66.6 million tonnes, about 42%.[77] 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[78] in 2009.[79]
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.[80][81] Aquaculture is also currently one of the fastest-growing areas of food production in the U.S.[82]
About 90% of all U.S. shrimp consumption is farmed and imported.[83] 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.[84] FAO estimates that in 2016, overall, women accounted for nearly 14 percent of all people directly engaged in the fisheries and aquaculture primary sector.[48]
Category | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 |
Production | ||||||
Capture | ||||||
Inland | 10.7 | 11.2 | 11.2 | 11.3 | 11.4 | 11.6 |
Marine | 81.5 | 78.4 | 79.4 | 79.9 | 81.2 | 79.3 |
Total capture | 92.2 | 89.5 | 90.6 | 91.2 | 92.7 | 90.9 |
Aquaculture | ||||||
Inland | 38.6 | 42 | 44.8 | 46.9 | 48.6 | 51.4 |
Marine | 23.2 | 24.4 | 25.4 | 26.8 | 27.5 | 28.7 |
Total aquaculture | 61.8 | 66.4 | 70.2 | 73.7 | 76.1 | 80 |
Total world fisheries and aquaculture | 154 | 156 | 160.7 | 164.9 | 168.7 | 170.9 |
Utilization | ||||||
Human consumption | 130 | 136.4 | 140.1 | 144.8 | 148.4 | 151.2 |
Non-food uses | 24 | 19.6 | 20.6 | 20 | 20.3 | 19.7 |
Population (billions) | 7 | 7.1 | 7.2 | 7.3 | 7.3 | 7.4 |
Per capita apparent consumption (kg) | 18.5 | 19.2 | 19.5 | 19.9 | 20.2 | 20.3[48] |
National laws, regulations, and management
Laws governing aquaculture practices vary greatly by country[85] 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;[86] 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[87] to address this issue and "to meet the growing demand for healthy seafood, to create jobs in coastal communities, and restore vital ecosystems." In 2011, Congresswoman Lois Capps introduced the National Sustainable Offshore Aquaculture Act of 2011[88] "to establish a regulatory system and research program for sustainable offshore aquaculture in the United States exclusive economic zone"; however, the bill was not enacted into law.
Over-reporting
China overwhelmingly dominates the world in reported aquaculture output,[89] 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, the fisheries scientists Reg Watson and Daniel Pauly expressed concerns in a letter to Nature, that China was over reporting its catch from wild fisheries in the 1990s.[7][90] 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 be 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.[91][92]
China disputed this claim. The official
Aquacultural methods
Mariculture
Mariculture refers to the cultivation of marine organisms in seawater, usually in sheltered coastal or offshore waters. The farming of marine fish is an example of mariculture, and so also is the farming of marine crustaceans (such as shrimp), mollusks (such as oysters), and seaweed. Channel catfish (Ictalurus punctatus), hard clams (Mercenaria mercenaria) and Atlantic salmon (Salmo salar) are prominent in the U.S. mariculture.[97]
Mariculture may consist of raising the organisms on or in artificial enclosures such as in floating netted enclosures for salmon and on racks 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.[75]
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).[98]
"Multi-trophic" refers to the incorporation of species from different
Sometimes the term "integrated aquaculture" is used to describe the integration of monocultures through water transfer.[100] 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
Recently, copper alloys have become important netting materials in aquaculture because they are antimicrobial (i.e., they destroy
Issues
If performed without consideration for potential local environmental impacts, aquaculture in inland waters can result in more environmental damage than
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.
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.[111]
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
Farmed salmon consume more
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.[8] 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.[116] The USDA has also experimented with using grain-based feeds for farmed trout.[117] 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.[118]
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.[119] Escaped fish can become invasive, out-competing native species.[120][121][122]
Coastal ecosystems
Aquaculture is becoming a significant threat to
Pollution from sea cage aquaculture
In 2016, mass fish kill events impacted salmon farmers along Chile's coast and the wider ecology.[128] Increases in aquaculture production and its associated effluent were considered to be possible contributing factors to fish and molluscan mortality.[129]
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.[130] Significant increases in ammonium and total phosphorus, a driver for eutrophication in freshwater systems,[131] were measured in the hypolimnion of the lake. Annual phosphorus inputs from aquaculture waste exceeded that of natural inputs from atmospheric deposition and inflows,[132] and phytoplankton biomass has had a four fold annual increase following the initiation of the experimental farm.[133]
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.[134] 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.[135] 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."[136]
Ecological benefits
While some forms of aquaculture can be devastating to ecosystems, such as shrimp farming in mangroves, other forms can be very 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.[137] 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.[citation needed]([138]
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[139] The shellfish acting as herbivores 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.[citation needed]
Seaweed farming is a carbon negative crop, with a high potential for climate change mitigation .[140] The IPCC Special Report on the Ocean and Cryosphere in a Changing Climate recommends "further research attention" as a mitigation tactic.[141]
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
- Freedom from hunger & thirst
- Freedom from discomfort
- Freedom from pain, disease, or injury
- Freedom to express normal behaviour
- Freedom from fear and distress
However, the controversial issue in aquaculture is whether fish and farmed marine invertebrates are actually
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.[145]
Optimal stocking density is often defined by the
Many of these interactions and effects cause stress in the fish, which can be a major factor in facilitating fish disease.[144] 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.[151] 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.[152] There are also a number of prominent viral and bacterial pathogens that can have severe effects on internal organs and nervous systems.[153]
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. 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.[146] 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.[146]
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.
Aquaculture is sometimes part of an environmental rehabilitation program or as an aid in conserving endangered species.[154]
Prospects
Global
Apart from fish and shrimp, some aquaculture undertakings, such as seaweed and filter-feeding bivalve mollusks like
Some profitable aquaculture cooperatives promote sustainable practices.
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.
Some 16 countries now use geothermal energy for aquaculture, including China, Israel, and the United States.[163] 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.[163]
See also
- Agroecology
- Alligator farm
- Aquaponics
- Blue revolution
- Copper alloys in aquaculture
- Maggots used as food for fish
- Fish hatchery
- Fisheries science
- Industrial aquaculture
- List of commercially important fish species
- Recirculating aquaculture system
- Resource decoupling
Aquaculture by Country:
- Aquaculture in Australia
- Aquaculture in Canada
- Aquaculture in Chile
- Aquaculture in China
- Aquaculture in East Timor
- Aquaculture in the Federated States of Micronesia
- Aquaculture in Fiji
- Aquaculture in Indonesia
- Aquaculture in Kiribati
- Aquaculture in Madagascar
- Aquaculture in the Marshall Islands
- Aquaculture in Nauru
- Aquaculture in New Zealand
- Aquaculture in Palau
- Aquaculture in Papua New Guinea
- Aquaculture in Samoa
- Aquaculture in the Solomon Islands
- Aquaculture in South Africa
- Aquaculture in South Korea
- Aquaculture in Tonga
- Aquaculture in Tuvalu
- Aquaculture in Vanuatu
Sources
This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 IGO (license statement/permission). Text taken from In brief, The State of World Fisheries and Aquaculture, 2018, FAO, FAO.
Notes
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Further reading
- William McClarney (2013). Freshwater Aquaculture. Echo Point Books & Media, LLC. ISBN 978-1-62654-990-6.
- AquaLingua ISBN 978-82-529-2389-6
- Rice–Fish Culture in China (1995), OCLC 35883297
- Stickney, Robert R. (2009). Aquaculture: An Introductory Text. Centre for Agriculture and Bioscience International (CAB International). ISBN 978-1-84593-589-4.
- Nash, Colin (23 November 2010). The History of Aquaculture. John Wiley & Sons. ISBN 978-0-470-95886-5.
- Wilkey, Ryan; Myers, Mackenzie; Rintoul, Lyla; Robinson, Torie; Spina, Michelle (1 June 2011). "Fiji Aquaculture/Rice Farming Analysis". Digital Commons at Cal Poly.
- Ottinger, M.; Clauss, K.; Kuenzer, C. (2016). "Aquaculture: Relevance, Distribution, Impacts and Spatial Assessments – A Review". Ocean & Coastal Management. 119: 244–266. .
- Ottinger, M.; Clauss, K.; Kuenzer, C. (2017). "Large-Scale Assessment of Coastal Aquaculture Ponds with Sentinel-1 Time Series Data" (PDF). Remote Sensing. 9 (5): 440. doi:10.3390/rs9050440.)
{{cite journal}}
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External links
- Aquaculture topic page from Woods Hole Oceanographic Institution
- "Aquaculture Factsheet". Waitt Institute. Archived from the original on 2015-06-17. Retrieved 2015-06-08.
- Aquaculture at Curlie
- Aquaculture science at Curlie
- The Coastal Resources Center
- NOAA aquaculture
- The University of Hawaii's AquacultureHub
- TED-Ed lesson on aquaculture