Marine shrimp farming
Marine shrimp farming is an
Shrimp farming has changed from traditional, small-scale businesses in Southeast Asia into a global industry. Technological advances have led to growing shrimp at ever higher densities, and broodstock is shipped worldwide. Virtually all farmed shrimp are of the family Penaeidae, and just two species – Penaeus vannamei (Pacific white shrimp) and Penaeus monodon (giant tiger prawn) – account for roughly 80% of all farmed shrimp. These industrial monocultures are very susceptible to diseases, which have caused several regional wipe-outs of farm shrimp populations. Increasing ecological problems, repeated disease outbreaks, and pressure and criticism from both NGOs and consumer countries led to changes in the industry in the late 1990s and generally stronger regulation by governments. In 1999, a program aimed at developing and promoting more sustainable farming practices was initiated, including governmental bodies, industry representatives, and environmental organizations.
History and geography
Shrimp has been farmed in South East Asia and China for centuries, using traditional low-density methods. In Indonesia, the use of brackish water ponds, called tambaks, can be traced back as far as the 15th century. They used small scale ponds for monoculture or polycultured with other species, such as milkfish, or in rotation with rice, using the rice paddies for shrimp cultures during the dry season, when no rice could be grown.[2] Such cultures often were in coastal areas or on river banks. Mangrove areas were favored because of their abundant natural shrimp.[3] Wild juvenile shrimp were trapped in ponds and reared on naturally occurring organisms in the water until they reached the desired size for harvesting.[4]
Industrial shrimp farming can be traced to the 1930s, when
Farming methods
When shrimp farming emerged to satisfy demand that had surpassed the wild fisheries' capacity, the
Until the mid-1980s, most farms were stocked with young wild animals, called 'postlarvae', typically caught locally. Postlarvae fishing became an important economic sector in many countries. To counteract the depletion of fishing grounds and to ensure a steady supply of young shrimp, the industry started breeding shrimp in hatcheries.
Life cycle
Shrimp mature and breed only in a marine
Supply chain
In shrimp farming, this life cycle occurs under controlled conditions. The reasons to do so include more intensive farming, improved size control resulting in more uniformly sized shrimp, and better predator control, but also the ability to accelerate growth and maturation by controlling the climate (especially in farms in the temperate zones, using greenhouses). There are three different stages:
- Hatcheries breed shrimp and produce nauplii or even postlarvae, which they sell to farms. Large shrimp farms maintain their own hatcheries and sell nauplii or postlarvae to smaller farms in the region.
- Nurseries grow postlarvae and accustom them to the marine conditions in the grow-out ponds.
- In the grow-out ponds the shrimp are grown from juveniles to marketable size, which takes between three and six months.
Most farms produce one to two harvests a year; in tropical climates, even three are possible. Because of the need for salt water, shrimp farms are located on or near a coast. Inland shrimp farms have also been tried in some regions, but the need to ship salt water and competition for land with agricultural users led to problems. Thailand banned inland shrimp farms in 1999.[10]
Hatcheries
Small-scale hatcheries are very common throughout Southeast Asia. Often run as family businesses and using a low-technology approach, they use small tanks (less than ten tons) and often low animal densities.[5] They are susceptible to disease, but due to their small size, they can typically restart production quickly after disinfection. The survival rate is anywhere between zero and 90%, depending on a wide range of factors, including disease, the weather, and the experience of the operator.[5]
Greenwater hatcheries are medium-sized hatcheries using large tanks with low animal densities. To feed the shrimp larvae, an algal bloom is induced in the tanks. The survival rate is about 40%.[5]
Galveston hatcheries (named after Galveston, Texas, where they were developed) are large-scale, industrial hatcheries using a closed and tightly controlled environment. They breed the shrimp at high densities in large (15–30 t) tanks. Survival rates vary between 0% and 80%, but typically achieve 50%.[5]
In hatcheries, the developing shrimp are fed on a diet of algae and later also
Nurseries
Many farms have nurseries where the postlarval shrimp are grown into juveniles for another three weeks in separate ponds, tanks, or so-called raceways. A raceway is a rectangular, long, shallow tank through which water flows continuously.[11]
In a typical nursery, there are 150 to 200 animals per square metre. They are fed on a high-protein diet for at most three weeks before they are moved to the grow-out ponds. At that time, they weigh between one and two grams. The water salinity is adjusted gradually to that of the grow-out ponds.
Farmers refer to postlarvae as "PLs", with the number of days suffixed (i.e., PL-1, PL-2, etc.). They are ready to be transferred to the grow-out ponds after their gills have branched, which occurs around PL-13 to PL-17 (about 25 days after hatching). Nursing is not absolutely necessary, but is favoured by many farms because it makes for better food utilization, improves the size uniformity, helps use the infrastructure better, and can be done in a controlled environment to increase the harvest. The main disadvantage of nurseries is that some of the postlarval shrimp die upon the transfer to the grow-out pond.[5]
Some farms do not use a nursery, but stock the postlarvae directly in the grow-out ponds after having acclimated them to the appropriate temperature and salinity levels in an acclimation tank. Over the course of a few days, the water in these tanks is changed gradually to match that of the grow-out ponds. The animal density should not exceed 500/litre for young postlarvae and 50/liter for larger ones, such as PL-15.[12]
Grow-out
In the grow-out phase, the shrimp are grown to maturity. The postlarvae are transferred to ponds where they are fed until they reach marketable size, which takes about another three to six months. Harvesting the shrimp is done by fishing them from the ponds using nets or by draining the ponds. Pond sizes and the level of technical infrastructure vary.
Extensive shrimp farms using traditional low-density methods are invariably located on a coast and often in mangrove areas. The ponds range from just a few to more than 100 hectares; shrimp are stocked at low densities (2–3 animals per square metre, or 25,000/ha).[Note 2] The tides provide for some water exchange, and the shrimp feed on naturally occurring organisms. In some areas, farmers even grow wild shrimp by just opening the gates and impounding wild larvae. Prevalent in poorer or less developed countries where land prices are low, extensive farms produce annual yields from 50 to 500 kg/ha of shrimp (head-on weight). They have low production costs (US$1–3/kg live shrimp), are not very labor-intensive, and do not require advanced technical skills.[13]
Semi-intensive farms do not rely on tides for water exchange, but use pumps and a planned pond layout. They can therefore be built above the high tide line. Pond sizes range from 2 to 30 ha; the stocking densities range from 10 to 30/square meter (100,000–300,000/ha). At such densities, artificial feeding using industrially prepared shrimp feeds and fertilizing the pond to stimulate the growth of naturally occurring organisms become a necessity. Annual yields range from 500 to 5,000 kg/ha, while production costs are in the range of US$2–6/kg live shrimp. With densities above 15 animals per square meter, aeration is often required to prevent oxygen depletion. Productivity varies depending upon water temperature, thus it is common to have larger sized shrimp in some seasons than in others.
Intensive farms use even smaller ponds (0.1–1.5 hectares or 0.25–3.71 acres) and even higher stocking densities. The ponds are actively managed: they are aerated, there is a high water exchange to remove waste products and maintain water quality, and the shrimp are fed on specially designed diets, typically in the form of formulated pellets. Such farms produce annual yields between 5,000 and 20,000 kg/ha; a few super-intensive farms can produce as much as 100,000 kg/ha. They require an advanced technical infrastructure and highly trained professionals for constant monitoring of water quality and other pond conditions; their production costs are in the range of US$4–8/kg live shrimp.
Estimates on the production characteristics of shrimp farms vary. Most studies agree that about 15-20% of all shrimp farms worldwide are extensive farms, another 25–30% are semi-intensive, and the rest are intensive farms. Regional variation is high, though, and Tacon reports wide discrepancies in the percentages claimed for individual countries by different studies.[14]
Animal welfare
Eyestalk ablation is the removal of one (unilateral) or both (bilateral) eyestalks from a crustacean. It is routinely practiced on female shrimps (or prawns) in almost every marine shrimp maturation or reproduction facility in the world, both research and commercial. The aim of ablation under these circumstances is to stimulate the female shrimp to develop mature ovaries and spawn.[15]
Most captive conditions for shrimp cause inhibitions in females that prevent them from developing mature ovaries. Even in conditions where a given species will develop ovaries and spawn in captivity, use of eyestalk ablation increases total egg production and increases the percentage of females in a given population that will participate in reproduction. Once females have been subjected to eyestalk ablation, complete ovarian development often ensues within as little as 3 to 10 days.
Feeding
While extensive farms mainly rely on the natural productivity of the ponds, more intensively managed farms rely on artificial shrimp feeds, either exclusively or as a supplement to the organisms that naturally occur in a pond. A food chain is established in the ponds, based on the growth of phytoplankton. Fertilizers and mineral conditioners are used to boost the growth of the phytoplankton to accelerate the growth of the shrimp. Waste from the artificial food pellets and shrimp excrement can lead to the eutrophication of the ponds.
Artificial feeds come in the form of specially formulated, granulated pellets that disintegrate quickly. Up to 70% of such pellets are wasted, as they decay before the shrimp have eaten them.
Farmed species
Although there are many species of shrimp and prawn, only a few of the larger ones are actually cultivated, all of which belong to the family of
Many species are unsuitable for farming: they are too small to be profitable, or simply stop growing when crowded together, or are too susceptible to diseases. The two species dominating the market are:- Taura disease.
- whitespot diseaseand the difficulty of breeding it in captivity, it is gradually being replaced by L. vannamei since 2001.
Together, these two species account for about 80% of the whole farmed shrimp production.[20] Other species being bred are:
- IHHN viruswiped out nearly the whole population in the late 1980s. A few stocks survived and became resistant against this virus. When it was discovered that some of these were also resistant against the Taura virus, some farms again bred P. stylirostris from 1997 on.
- China and the western coast of Koreaand is being farmed in China. It grows to a maximum length of only 18 cm, but tolerates colder water (min. 16 °C). Once a major factor on the world market, it is today used almost exclusively for the Chinese domestic market after a disease wiped out nearly all the stocks in 1993.
- US$100 per pound($220/kg).
- Indian white shrimp (P. indicus) is a native of the coasts of the Indian Ocean and is widely bred in India, Iran and the Middle East and along the African shores.
- Banana shrimp (P. merguiensis) is another cultured species from the coastal waters of the Indian Ocean, from Oman to Indonesia and Australia. It can be grown at high densities.
Several other species of Penaeus play only a very minor role in shrimp farming. Some other kinds of shrimp also can be farmed, e.g. the "Akiami paste shrimp" or
Diseases
There are a variety of lethal
Yellowhead disease, called Hua leung in Thai, affects P. monodon throughout Southeast Asia.[22] It had been reported first in Thailand in 1990. The disease is highly contagious and leads to mass mortality within 2 to 4 days. The cephalothorax of an infected shrimp turns yellow after a period of unusually high feeding activity ending abruptly, and the then moribund shrimp congregate near the surface of their pond before dying.[23]
Taura syndrome was first reported from shrimp farms on the Taura river in Ecuador in 1992. The host of the virus causing the disease is P. vannamei, one of the two most commonly farmed shrimp. The disease spread rapidly, mainly through the shipping of infected animals and broodstock. Originally confined to farms in the Americas, it has also been propagated to Asian shrimp farms with the introduction of L. vannamei there. Birds are thought to be a route of infection between farms within one region.[27]
Infectious hypodermal and hematopoietic necrosis (IHHN) is a disease that causes mass mortality among P. stylirostris (as high as 90%) and severe deformations in L. vannamei. It occurs in Pacific farmed and wild shrimp, but not in wild shrimp on the Atlantic coast of the Americas.[28]
There are also a number of
With their high mortality rates, diseases represent a very real danger to shrimp farmers, who may lose their income for the whole year if their ponds are infected. Since most diseases cannot yet be treated effectively, the industry's efforts are focused on preventing disease outbreak in the first place. Active water quality management helps avoid poor pond conditions favorable to the spread of diseases, and instead of using larvae from wild catches,
Economy
The total global production of farmed shrimp reached 2.5 million tonnes in 2005.[33] This accounts for 42% of the total shrimp production that year (farming and wild catches combined). The largest single market for shrimp is the United States, importing between 500 – 600,000 tonnes of shrimp products yearly in the years 2003–2009.[34] About 200,000 tonnes yearly are imported by Japan,[35][36] while the European Union imported in 2006 another about 500,000 tonnes of tropical shrimps, with the largest importers being Spain and France.[Note 4] The EU also is a major importer of coldwater shrimp from catches, mainly common shrimp (Crangon crangon) and Pandalidae such as Pandalus borealis; in 2006, these imports accounted for about another 200,000 tonnes.[Note 5]
The import prices for shrimp fluctuate wildly. In 2003, the import price per kilogram shrimp in the United States was US$8.80, slightly higher than in Japan at US$8.00. The average import price in the EU was only about US$5.00/kg; this much lower value is explained by the fact that the EU imports more coldwater shrimp (from catches) that are much smaller than the farmed warm water species, and thus attain lower prices. In addition, Mediterranean Europe prefers head-on shrimp, which weigh approximately 30% more, but have a lower unit price.[37]
About 75% of the world production of farmed shrimp comes from Asian countries; the two leading nations being
Region | Country | Production in 1,000 tonnes per year, rounded | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1985 | 86 | 87 | 88 | 89 | 1990 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 2000 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | ||
Asia | China
|
40 | 83 | 153 | 199 | 186 | 185 | 220 | 207 | 88 | 64 | 78 | 89 | 96 | 130 | 152 | 192 | 267 | 337 | 432 | 468 | 546 | 640 | 710 | 725 | 796 |
Thailand | 10 | 12 | 19 | 50 | 90 | 115 | 161 | 185 | 223 | 264 | 259 | 238 | 225 | 250 | 274 | 309 | 279 | 264 | 330 | 360 | 401 | 494 | 523 | 507 | 539 | |
Vietnam | 8 | 13 | 19 | 27 | 28 | 32 | 36 | 37 | 39 | 45 | 55 | 46 | 45 | 52 | 55 | 90 | 150 | 181 | 232 | 276 | 327 | 349 | 377 | 381 | 411 | |
Indonesia | 25 | 29 | 42 | 62 | 82 | 84 | 116 | 120 | 117 | 107 | 121 | 125 | 127 | 97 | 121 | 138 | 149 | 160 | 191 | 239 | 280 | 340 | 330 | 408 | 337 | |
India | 13 | 14 | 15 | 20 | 28 | 35 | 40 | 47 | 62 | 83 | 70 | 70 | 67 | 83 | 79 | 97 | 103 | 115 | 113 | 118 | 131 | 132 | 99 | 80 | 97 | |
Bangladesh | 11 | 15 | 15 | 17 | 18 | 19 | 20 | 21 | 28 | 29 | 32 | 42 | 48 | 56 | 58 | 59 | 55 | 56 | 56 | 58 | 63 | 65 | 64 | 67 | 8 | |
Philippines | 29 | 30 | 35 | 44 | 47 | 48 | 47 | 77 | 86 | 91 | 89 | 77 | 41 | 38 | 39 | 41 | 42 | 37 | 37 | 37 | 39 | 41 | 43 | 48 | 51 | |
Myanmar | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 2 | 2 | 5 | 5 | 6 | 7 | 19 | 30 | 49 | 49 | 48 | 48 | 46 | |
Saudi Arabia | 0 | 0 | 0 | 0 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | 1 | 2 | 2 | 2 | 4 | 5 | 9 | 9 | 11 | 12 | 15 | 18 | 21 | |
Taiwan | 17 | 45 | 80 | 34 | 22 | 15 | 22 | 16 | 10 | 8 | 11 | 13 | 6 | 5 | 5 | 7 | 9 | 9 | 10 | 9 | 10 | 8 | 8 | 7 | 5 | |
Malaysia | <1 | <1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 6 | 7 | 8 | 10 | 10 | 12 | 16 | 27 | 26 | 26 | 31 | 33 | 35 | 35 | 51 | 69 | |
Americas | Brazil | <1 | <1 | <1 | <1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 4 | 7 | 16 | 25 | 40 | 60 | 90 | 76 | 63 | 65 | 65 | 76 | 65 |
Ecuador | 30 | 44 | 69 | 74 | 70 | 76 | 105 | 113 | 83 | 89 | 106 | 108 | 133 | 144 | 120 | 50 | 45 | 63 | 77 | 90 | 118 | 149 | 150 | 150 | 179 | |
Mexico | <1 | <1 | <1 | <1 | 3 | 4 | 5 | 8 | 12 | 13 | 16 | 13 | 17 | 24 | 29 | 33 | 48 | 46 | 46 | 62 | 90 | 112 | 112 | 130 | 126 | |
Honduras | <1 | 1 | 2 | 3 | 3 | 3 | 4 | 6 | 8 | 9 | 7 | 10 | 9 | 7 | 7 | 8 | 11 | 13 | 17 | 18 | 21 | 27 | 26 | 27 | 15 | |
Colombia | <1 | <1 | 1 | 1 | 3 | 6 | 7 | 9 | 7 | 9 | 8 | 5 | 7 | 7 | 9 | 11 | 12 | 14 | 17 | 18 | 19 | 22 | 20 | 18 | 18 | |
Venezuela | 0 | 0 | 0 | <1 | <1 | <1 | 1 | 1 | 1 | 2 | 3 | 4 | 5 | 5 | 6 | 9 | 11 | 12 | 14 | 23 | 18 | 21 | 18 | 16 | 10 | |
Entries in italics indicate gross estimates in the FAO databases.[Note 6] Bolded numbers indicate some recognizable disease events.
|
Disease problems have repeatedly impacted the shrimp production negatively. Besides the near-wipeout of P. chinensis in 1993, there were outbreaks of viral diseases that led to marked declines in the per-country production in 1996/97 in Thailand and repeatedly in Ecuador.[42] In Ecuador alone, production suffered heavily in 1989 (IHHN), 1993 (Taura), and 1999 (whitespot).[43] Another reason for sometimes wild changes in shrimp farm output are the import regulations of the destination countries, which do not allow shrimp contaminated by chemicals or antibiotics to be imported.
In the 1980s and through much of the 1990s, shrimp farming promised high profits. The investments required for extensive farms were low, especially in regions with low land prices and wages. For many tropical countries, especially those with poorer economies, shrimp farming was an attractive business, offering jobs and incomes for poor coastal populations and has, due to the high market prices of shrimp, provided many developing countries with non-negligible foreign currency earnings. Many shrimp farms were funded initially by the World Bank or substantially subsidized by local governments.[44]
In the late 1990s, the economic situation changed. Governments and farmers alike were under increasing pressure from NGOs and the consumer countries, who criticized the practices of the trade.
Socioeconomic aspects
Shrimp farming offers significant employment opportunities, which may help alleviate the poverty of the local coastal populations in many areas, if it is properly managed.[51] The published literature on that topic shows large discrepancies, and much of the available data are of anecdotal nature.[52] Estimates of the labor intensity of shrimp farms range from about one-third [53] to three times more[54] than when the same area was used for rice paddies, with much regional variation and depending on the type of farms surveyed. In general, intensive shrimp farming requires more labor per unit area than extensive farming. Extensive shrimp farms cover much more land area and are often, but not always, located in areas where no agricultural land uses are possible.[55] Supporting industries such as feed production or storage, handling, and trade companies should also not be neglected, even if not all of them are exclusive to shrimp farming.
Typically, workers on a shrimp farm can get better wages than with other employment. A global estimate from one study is that a shrimp farm worker can earn 1.5–3 times as much as in other jobs;[56] a study from India arrived at a salary increase of about 1.6,[54] and a report from Mexico states the lowest paid job at shrimp farms was paid in 1996 at 1.22 times the average worker salary in the country.[57]
NGOs have frequently criticized that most of the profits went to large conglomerates instead of to the local population. While this may be true in certain regions, such as
Whether the local population benefits from shrimp farming is also dependent on the availability of sufficiently trained people.[60] Extensive farms tend to offer mainly seasonal jobs during harvest that do not require much training. In Ecuador, many of these positions are known to have been filled by migrant workers.[61] More intensive farms have a need for year-round labor in more sophisticated jobs.
Marketing
For commercialization, shrimp are graded and marketed in different categories. From complete shrimp (known as "head-on, shell-on" or HOSO) to peeled and deveined (P&D), any presentation is available in stores. The animals are graded by their size uniformity and then also by their count per weight unit, with larger shrimp attaining higher prices.
Ecological impacts
Shrimp farms of all types, from extensive to super-intensive, can cause severe ecological problems wherever they are located. For extensive farms, huge areas of
Intensive farms, while reducing the direct impact on the mangroves, have other problems. Their nutrient-rich effluents (industrial shrimp feeds disintegrate quickly, as little as 30% are actually eaten by the shrimp with a corresponding economic loss to the farmer, the rest is wasted
Prolonged use of a pond can lead to an incremental buildup of a sludge at the pond's bottom from waste products and excrement.
The global nature of the shrimp farming business, and in particular the shipment of
Yet, the industry has been slowly changing since about 1999. It has adopted the "best management practices"[74] developed by the World Bank program, for example, and others.[75] and instituted educational programs to promote them.[76] Due to the mangrove protection laws enacted in many countries, new farms are usually of the semi-intensive kind, which are best constructed outside mangrove areas anyway. There is a trend to create even more tightly controlled environments in these farms, with the hope to achieve better disease prevention.[77] Waste water treatment has attracted considerable attention; modern shrimp farms routinely have effluent treatment ponds where sediments are allowed to settle at the bottom and other residuals are filtered. As such improvements are costly, the World Bank program also recommends low-intensity polyculture farming for some areas. Since it has been discovered that mangrove soils are effective in filtering waste waters and tolerate high nitrate levels, the industry has also developed an interest in mangrove reforestation, although its contributions in that area are still minor.[78] The long-term effects of these recommendations and industry trends cannot be evaluated conclusively yet.
Still, it was reported in 2012 that one pound of frozen shrimp adds one ton of carbon dioxide to the atmosphere, more than ten times that generated to produce the same weight of beef raised on cleared rainforest land.[79]
Social changes
Shrimp farming in many cases has far-reaching effects on the local coastal population. Especially in the boom years of the 1980s and 1990s, when the business was largely unregulated in many countries, the very fast expansion of the industry caused significant changes that sometimes were detrimental to the local population. Conflicts can be traced back to two root causes: competition for common resources such as land and water, and changes induced by wealth redistribution.
A significant problem causing much conflict in some regions, for instance in
Social tensions have occurred due to changes in the
In general, it has been found that shrimp farming is accepted best and introduced most easily and with the greatest benefits for the local communities if the farms are owned by local people instead of by restricted remote élites or large companies because local owners have a direct interest in maintaining the environment and good relations with their neighbors, and because it avoids the formation of large-scale land property.[85]
Sustainable practices
Although shrimp farming has disrupted social structures, it is possible for both commercial industries and independent farmers to succeed. Closed system shrimp aquaculture for instance, is becoming widely used in the US and is making its way to Southeast Asia. This system takes place indoors in moderate sized pools which efficiently circulates the water. In some cases filter feeders such as shellfish and other fish are introduced in the system, feeding off nutrients in the water that would otherwise be cycled out. This option is more environmentally safe than large scale intensive farming practices. Unfortunately, this system is capital intensive and would be difficult for small scale, independent shrimp farmers to acquire. However, this would be an excellent alternative for larger shrimp industries in Thailand.
Another alternative would be to revert to traditional shrimp farming practices, without overstocking and the use of harmful chemicals. This would be an ideal option for small scale shrimp farmers supplying for their own community as well as creating an independent food source.[86]
See also
- giant river prawn, Macrobrachium rosenbergii).[87] The global annual production of freshwater prawns (excluding crayfish and crabs) in 2003 was about 280,000 tonnes, of which China produced some 180,000 tonnes, followed by India and Thailand with some 35,000 tonnes each. China also produced about 370,000 tonnes of Chinese mitten crab (Eriocheir sinensis).[Note 7]
- Shrimp fishery
- Krill fishery
Notes
- palaemonids and "shrimp" for the marine penaeids.[1]
- ^ Since adult shrimp are bottom dwellers, stocking densities in ponds are usually given per area, not per water volume.
- ^ The taxonomy of the whole genus Penaeus is in flux. Pérez Farfante and Kensley[19] have proposed a subdivision or reassignment of several species in this genus to new genera based on morphological differences, in particular their genital characteristics. See Penaeus for more information. As a consequence, some of the farmed species are also known under names using the genera Litopenaeus, Farfantepenaeus, Fenneropenaeus, or Marsupenaeus instead of Penaeus. Penaeus vannamei, for instance, has become Litopenaeus vannamei.
- ^ FAO: FIGIS Commodities 1976–2006, query for imports into all EU countries, all shrimps and prawns entries except those giving species other than Penaeus spp. (also excluding "nei" entries; "nei" means "not elsewhere included"). For comparison, the U.S. was also included, and the numbers reported by that selection were found to correspond well with the U.S. DOA numbers after conversion from tonnes to 1,000 pounds. Retrieved February 25, 2010.
- ^ FAO: FIGIS Commodities 1976–2006, same query also including Cangon and Pandalidae. Retrieved February 25, 2010.
- FAOrelies on the voluntary reporting of countries for its fisheries databases; if no numbers are reported, the FAO fills in its own "guesstimate". Such estimates are marked in the databases, but these obviously also contain estimates made already by the reporting government agencies, recognizable only by the suspiciously round numbers.
- ^ Data extracted from the FAO Fisheries Global Aquaculture Production Database for freshwater crustaceans. The most recent data sets are for 2003 and sometimes contain estimates. Retrieved June 28, 2005.
References
- ^ a b c d IAA (2001), chapter 2.
- ^ Rönnbäck (2001), p. 1.
- ^ Lewis et al. (2003), p. 5.
- ^ "The Secrets of the Gei Wai". wwf.org.hk. WWF Hong Kong. Archived from the original on October 3, 2015. Retrieved October 2, 2015.
- ^ a b c d e f g h i Bob Rosenberry (August 2004). "About Shrimp Farming". ShrimpNews. Archived from the original on February 1, 2010. Retrieved June 28, 2005.
- ^ a b c ISAN (2000), pp. 9–10.
- ^ a b Hossain & Lin (2001), p. 4.
- ^ McClennan (2004), p. 43.
- ^ Yara Novelly (February 10, 2003). "Brazil's Shrimp Farming History". Archived from the original (E-mail) on February 9, 2012. Retrieved January 13, 2012.
- ^ a b "Bio-physical, socio-economic and environmental impacts of salt-affected soils". FAO Land and Water Development Division. 2000. Archived from the original on May 5, 2009. Retrieved August 23, 2005.
- ^ Peter van Wyk. Principles of Recirculating System Design (PDF). pp. 59–98. Archived from the original (PDF) on May 21, 2005. Retrieved December 24, 2016. In Van Wyk et al. (1999).
- ^ Peter van Wyk. Receiving and Acclimation of Postlarvae (PDF). pp. 115–125. Archived from the original (PDF) on July 14, 2007. Retrieved December 24, 2016. In Van Wyk et al. (1999).
- ^ Tacon (2002), p. 28.
- ^ Tacon (2002), p. 29.
- PMID 21915325.
- ^ Avalle et al. (2003), p. 39.
- ^ Based on data sourced from the FishStat database
- ^ B. Rosenberry: Species of Farm-Raised Shrimp, ShrimpNews, August 2004. Archived URL last accessed February 15, 2007.
- ^ Pérez Farfante & Kensley (1997)
- ^ Josueit (2004), p. 8.
- ^ Crustacean diseases (PDF). pp. 155–220. Retrieved December 24, 2016. In Bondad-Reantaso et al. (2001)
- ^ Gulf States Marine Fisheries Commission: Non-Native Species Summaries: Yellowhead Virus (YHV), 2003. URL last accessed June 23, 2005. Data temporarily withdrawn pending review. Archived link with the data.
- ^ Yellowhead disease (PDF). pp. 144–157.[permanent dead link] In OIE (2009).
- ^ Maierbrugger, Arno (July 16, 2013). "Thailand's shrimp export set to decline by half". Inside Investor. Retrieved July 19, 2013.
- ^ White spot disease (PDF). pp. 121–131. Archived from the original (PDF) on July 10, 2012. Retrieved January 13, 2012. In OIE (2009).
- ^ Gulf States Marine Fisheries Commission: Non-Native Species Summaries: White Spot Syndrome Baculovirus Complex (WSBV), 2003. URL last accessed June 23, 2005. Data temporarily withdrawn pending review. Archived link with the data.
- ^ Taura syndrome (PDF). pp. 105–120.[permanent dead link] In OIE (2009).
- ^ Infectious hypodermal and haematopoietic necrosis (PDF). pp. 78–95. Archived from the original (PDF) on September 7, 2012. Retrieved January 13, 2012. In OIE (2009).
- ^ Kevan L. Main & Rolland Laramore. Shrimp health management (PDF). pp. 163–177. Archived from the original (PDF) on January 21, 2007. In Van Wyk et al. (1999).
- ^ B. Rosenberry: The Rise and Fall of Chloramphenicol, ShrimpNews, May 2005. Archived URL last accessed February 15, 2007.
- ^ Ceatech USA, Inc.: The Rationale to use SPF broodstock. Retrieved August 23, 2005.
- ^ McClennan (2004), p. 50.
- ^ FAO, The State of World Fisheries and Aquaculture, p. 124.
- ^ U.S. Department of Agriculture: U.S. Shrimp Imports by Volume Archived March 31, 2015, at the Wayback Machine (Aquaculture Data Archived February 20, 2010, at the Wayback Machine), February 2010. Retrieved February 23, 2010.
- ^ PIC: Market information: shrimps and crabs Archived May 5, 2010, at the Wayback Machine. Data for 1994–1998. Retrieved February 23, 2010.
- ^ NOAA, National Marine Fisheries Service, Southwest Regional Office: Japanese Shrimp Imports Archived February 16, 2013, at the Wayback Machine, monthly data from 1997 on. URl last accessed February 23, 2010.
- ^ Josueit (2004), p. 16.
- ^ a b FIGIS; FAO databases, accessed January 13, 2012.
- ^ FoodMarket: Shrimp Production Archived March 12, 2016, at the Wayback Machine; data from GlobeFish, 2001. Retrieved June 23, 2005.
- ^ McClennan (2004), p. 70.
- ^ B. Rosenberry: Annual Reports on World Shrimp Farming Archived August 16, 2005, at the Wayback Machine; Comments on the quality of aquaculture statistics in the on-line excerpts 2000–2004. Retrieved August 18, 2005.
- ^ Josueit (2004), p. 7f.
- ^ Briggs et al. (2003), p. 6.
- ^ Lewis et al. (2003)
- ^ "U.S. Bans Shrimp: Thailand Must Adjust". Thai Farmers Research Center. Archived from the original on October 27, 2005. Retrieved August 19, 2005.
- ^ B. Rosenberry: USA Shrimp Fishermen Dump Their Case on the World's Shrimp Farmers, ShrimpNews, January 2005. Archived URL last accessed February 15, 2007.
- ^ U.S. Department of Commerce: Amended Final Determinations and Issuance of Antidumping Duty Orders Archived May 14, 2017, at the Wayback Machine, January 26, 2005. Retrieved February 23, 2010.
- ^ McClennan (2004), p. 44.
- ^ B. Rosenberry: Annual Reports on World Shrimp Farming Archived August 16, 2005, at the Wayback Machine; Comments on shrimp prices in the on-line excerpts 2000–2004. Retrieved August 18, 2005.
- ^ McClennan (2004), p. 19.
- ^ Lewis et al. (2003), p. 22.
- ^ World Bank et al. (2002), p. 43.
- ^ Barraclough & Finger-Stich (1996), p. 14.
- ^ a b IAA (2001), chapter 6, p. 76.
- ^ Hempel et al. (2002), p. 42f.
- ^ World Bank et al. (2002), p. 45.
- ^ Lewis et al. (2003), p. 1.
- ^ Barraclough & Finger-Stich (1996), p. 17.
- ^ Kumaran et al. (2003)
- ^ Barraclough & Finger-Stich (1996), p. 15.
- ^ McClennan (2004), p. 55.
- ^ Tanavud et al. (2001), p. 330.
- ^ Wilkinson (2002)
- ^ Fitzpatrick et al. (2006)
- ^ Valiela et al. (2001)
- ^ Lewis et al. (2003), p. 9.
- ^ Lewis et al. (2003), p. 13.
- National Geographic News. Archived from the originalon January 31, 2007. Retrieved August 20, 2007.
- ^ "Antibiotic Use in Aquaculture: Center for Disease Control Rebuttal" (PDF). National Aquaculture Association (NAA). December 20, 1999. Archived from the original (PDF) on August 13, 2007. Retrieved November 26, 2007.
- ^ NACA/MPEDA (2003), p. 8.
- ^ World Rainforest Movement: Unsustainable versus sustainable shrimp production Archived November 11, 2005, at the Wayback Machine, WRM Bulletin 51, October 2001. Retrieved August 20, 2007.
- ^ World Bank et al. (2002)
- ^ Rönnbäck (2003), p. 5.
- ^ NACA: Codes and Certification; Network of Aquaculture Centres in Asia-Pacific (NACA). Retrieved August 19, 2005.
- ^ Boyd et al. (2002)
- ^ "Responsible Aquaculture Program". Global Aquaculture Alliance. Archived from the original on March 14, 2009. Retrieved August 19, 2005.
- ^ McClennan (2004), p. 47.
- ^ Lewis et al. (2003), p. 47.
- ^ "Your Shrimp Cocktail Is Ruining the Planet - Global - The Atlantic Wire". Archived from the original on February 23, 2012.
- ^ Barraclough & Finger-Stich (1996), p. 23ff.
- ^ McClennan (2004), p. 95.
- ^ DeWalt (2000)
- ^ a b Hempel et al. (2002), p. 44.
- ^ Barraclough & Finger-Stich (1996), p. 37.
- ^ World Bank et al. (2002), p. 47.
- ^ "Sustainable Alternatives of Shrimp Aquaculture". Mangrove Action Project. Archived from the original on November 19, 2012. Retrieved December 23, 2019.
- ^ New (2002), pp. xiii–xiv.
Bibliography
- Avalle, Olivier, Olivier Millous & Jean-François Virmaux (2003). L'élevage de la crevette en zone tropicale [Shrimp farming in the tropical zone] (PDF) (in French). Brussels, Belgium: Centre pour le Développement de l'Entreprise. Archived from the original (PDF) on June 30, 2006. Retrieved December 24, 2016.
{{cite book}}
: CS1 maint: multiple names: authors list (link) - Barraclough, S. & A. Finger-Stich (1996). Some Ecological and Social Implications of Commercial Shrimp Farming in Asia (PDF). United Nations Research Institute for Social Development (UNRISD) Discussion Paper. Vol. #74.
- Bondad-Reantaso, M. G.; S. E. McGladdery; I. East; R. P. Subasinghe, eds. (2001). Asia Diagnostic Guide to Aquatic Animal Diseases. FAO Fisheries Technical Paper. Vol. 402/2. NACA/FAO. ISBN 92-5-104620-4.
- Boyd, Claude E., John A. Hargreaves & Jason R. Clay (2002). Codes of Practice for Marine Shrimp Farming (PDF). World Bank/NACA/WWF/FAO Consortium Program on Shrimp Farming and the Environment. Retrieved January 13, 2012.
{{cite book}}
: CS1 maint: multiple names: authors list (link) - Briggs, Matthew, Simon Funge-Smith, Rohana Subasinghe & Michael Phillips (2003). Introductions and movement of Penaeus vannamei and Penaeus stylirostris in Asia and the Pacific. RAP publication. Vol. 2004/10. Bangkok: Food and Agriculture Organization.
{{cite book}}
: CS1 maint: multiple names: authors list (link) - DeWalt, Billie R. (May 22–28, 2000). Social and Environmental Aspects of Shrimp Aquaculture in Coastal Mexico (PDF). Mangrove 2000. Recife, Brazil. Archived from the original (PDF) on September 21, 2006.
- FIGIS: Data extracted from the FAO Fisheries Global Aquaculture Production Database for the seven commonly farmed species plus Pennaeus spp. The most recent data sets are for 2007 and sometimes contain estimates. Last accessed November 19, 2009.
- FAO: GLOBEFISH Shrimp Market Reports; FAOGlobeFish; 2003 – 2005.
- FAO: The State of World Fisheries and Aquaculture, 2008.
- Fitzpatrick, Rob, Bernie Powell & Steve Marvanek (June 9–15, 2006). Coastal Acid Sulphate Soils: National Atlas and Future Scenarios (PDF). 18th World Congress of Soil Science. CSIRO. Archived from the original (PDF) on October 24, 2007. Retrieved October 22, 2007.
{{cite conference}}
: CS1 maint: multiple names: authors list (link) - FoodMarket: Shrimp Production; data from GlobeFish, 2001. URL last accessed June 23, 2005.
- Global Aquaculture Alliance: Antidumping. URL last accessed August 23, 2005.
- Gulf States Marine Fisheries Commission: Non-Native Species Summaries: Yellowhead Virus (YHV), 2003. URl last accessed June 23, 2005.
- Gulf States Marine Fisheries Commission: Non-Native Species Summaries: White Spot Syndrome Baculovirus Complex (WSBV), 2003. URL last accessed June 23, 2005.
- Hempel, E., U. Winther & J. Hambrey (2002). Can Shrimp Farming Be Undertaken Sustainably?. World Bank/NACA/FAO/WWF Consortium Program on Shrimp Farming and the Environment.
{{cite book}}
: CS1 maint: multiple names: authors list (link) - Hossain, M. Z. & C. K. Lin (2001). Diversified Uses of Abandoned Shrimp Ponds – A Case Study in the Upper Gulf of Thailand (PDF). ITCZM Monograph. Vol. 5. Bangkok, Thailand: Asian Institute of Technology. Archived from the original (PDF) on May 8, 2005. Retrieved February 15, 2007.
- Indian Aquaculture Authority (April 2001). Shrimp Aquaculture and the Environment – An Environment Impact Assessment Report (PDF). Archived from the original (PDF) on July 16, 2011.
- Indian Aquaculture Authority (April 2001). Shrimp Aquaculture and the Environment – An Environment Impact Assessment Report (PDF). Archived from the original (PDF) on October 9, 2005.
- ISAN (2000). "Prawn to Trade, Prawn to Consume" (PDF). International Shrimp Action Network. Archived from the original (PDF) on November 3, 2005. Retrieved August 20, 2007.
- Josueit, H. (October 26–27, 2004). An overview on the world shrimp market (PDF). Presentation given at World Shrimp Markets 2004. Madrid, Spain: FAO GlobeFish. Archived from the original (PDF) on September 28, 2007.
- Kumaran, M., P. Ravichandran, B. P. Gupta & A. Nagavel (2003). "Shrimp farming practices and its socio-economic consequences in East Godavari District, Andhra Pradesh, India – a case study" (PDF). Aquaculture Asia. 8 (3): 48–52.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - Lewis, Roy R. III, Michael J. Philipps, Barry Clough & Donald J. Macintosh (2003). Thematic Review on Coastal Wetland Habitats and Shrimp Aquaculture (PDF). World Bank/NACA/WWF/FAO Consortium Program on Shrimp Farming and the Environment.
{{cite book}}
: CS1 maint: multiple names: authors list (link) - McClennan, Caleb (February 2, 2004). White Spot Syndrome Virus – The Economic, Environmental and Technical Implications of the Development of Latin American Shrimp Farming (PDF) on August 3, 2010. Retrieved January 13, 2012.
- Network of Aquaculture Centres in Asia-Pacific (NACA) & Marine Products Export Development Authority (MPEDA) (2003). Shrimp Health Management Extension Manual (PDF). India.
{{cite book}}
: CS1 maint: location missing publisher (link) - New, Michael B. (2002). Farming Freshwater Prawns (PDF). FAO Fisheries Technical Paper. Vol. 428. ISSN 0429-9345.
- Manual of Diagnostic Tests for Aquatic Animals 2011 (6th ed.). ISBN 978-92-9044-758-0. A169.
- ISBN 2-85653-510-0.
- Rönnbäck, Patrik (2001). Shrimp aquaculture – State of the art (PDF). Swedish EIA Centre Report. Vol. 1. Uppsala: ISBN 91-576-6113-8. Archived from the original(PDF) on February 4, 2006.
- Rönnbäck, Patrik (2003). Critical Analysis of Certified Organic Shrimp Aquaculture in Sidoarjo, Indonesia (PDF). Swedish Society for Nature Conservation. Archived from the original (PDF) on July 24, 2011.
- Tacon, Albert G. J. (2002). Thematic Review of Feeds and Feed Management Practices in Shrimp Aquaculture (PDF). World Bank/NACA/WWF/FAO Consortium Program on Shrimp Farming and the Environment.
- Tanavud, Charlchai, Chao Yongchalermchai, Abdollah Bennui & Omthip Densrisereekul1 (2001). "The expansion of inland shrimp farming and its environmental impacts in Songkla Lake basin" (PDF). Kasetsart Journal: Natural Science. 35 (3): 326–343. Archived from the original (PDF) on July 22, 2011. Retrieved October 12, 2007.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - Valiela, Ivan; Bowen, Jennifer L.; York, Joanna K. (2001). "Mangrove forests: one of the world's threatened major tropical environments" (PDF). .
- van Wyk, Peter, M. Davis-Hodgkins, R. Laramore, K. L. Main, J. Mountain & J. Scarpa (1999). Farming Marine Shrimp in Recirculating Freshwater Systems. Harbor Branch Oceanographic Institution. Archived from the original on July 13, 2007.)
{{cite book}}
: CS1 maint: multiple names: authors list (link - Wilkinson, Simon (2002). "The use of lime, gypsum, alum and potassium permanganate in water quality management" (PDF). Aquaculture Asia. 2 (2): 12–14.
- World Bank, NACA, WWF and FAO (2002). Shrimp Farming and the Environment. A World Bank, NACA, WWF and FAO Consortium Program "To analyze and share experiences on the better management of shrimp aquaculture in coastal areas" (PDF). Synthesis report. Work in Progress for Public Discussion. Published by the Consortium. 119 pages. Retrieved January 13, 2012.
{{cite book}}
: CS1 maint: multiple names: authors list (link)
External links
- ISBN 92-5-100896-5.
- McQuaid, J.: Thailand transformed by shrimp boom, March 28, 1996. Part of a series for which the newspaper The Times-Picayune, New Orleans, won the Pulitzer Prize in the category "public service" in 1997.
- Network of Aquaculture Centres in Asia-Pacific (NACA) has many of the World Bank et al. reports and a lot of current information about shrimp farming in Asia.
- Scampi.nu is a Swedish web site critical of shrimp farming that has many excellent links to English articles.
- Mai Po gei wai is a WWF–managed extensive shrimp farm in Hong Kong.
- Monterey Bay Aquarium 'Seafood Guide' offers good information on choosing seafood that is caught using sustainable and environmentally aware methods.
- Environmental Justice Foundation The Environmental Justice Foundation has created several video and written reports about the damaging shrimp farming causes to coastal habitats.
- Shrimp farming, from Greenpeace.
- Australian Prawn Farming Manual Download page of the 159 page PDF published by The State of Queensland, Department of Primary Industries and Fisheries