Shrimp farming
Shrimp farming is an aquaculture business that exists in either a marine or freshwater environment, producing shrimp or prawns[Note 1] (crustaceans of the groups Caridea or Dendrobranchiata) for human consumption.
Marine
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Commercial marine shrimp farming began in the 1970s, and production grew steeply, particularly to match the market demands of the United States, Japan, and Western Europe. The total global production of farmed shrimp reached more than 1.6 million tonnes in 2003, representing a value of nearly US$9 billion. About 75% of farmed shrimp is produced in Asia, particularly in China and Thailand. The other 25% is produced mainly in Latin America, where Brazil, Ecuador, and Mexico are the largest producers. The largest exporting nation is Thailand.
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 – Litopenaeus 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.
Freshwater
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Freshwater prawn farming shares many characteristics with, and many of the same problems as, marine shrimp farming. Unique problems are introduced by the developmental lifecycle of the main species (the giant river prawn, Macrobrachium rosenbergii).[1] The global annual production of freshwater prawns in 2010 was about 670,000 tons, of which China produced 615,000 tons (92%).[2]
Animal welfare
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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.[citation needed] The aim of ablation under these circumstances is to stimulate the female shrimp to develop mature ovaries and spawn.[3]
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 participate in reproduction. Once females have been subjected to eyestalk ablation, complete ovarian development often ensues within as little as 3 to 10 days.
See also
Footnotes
References
- ↑ New, M. B.: Farming Freshwater Prawns; FAO Fisheries Technical Paper 428, 2002. ISSN 0429-9345.
- ↑ Data extracted from the FAO Fisheries Global Aquaculture Production Database for freshwater crustaceans. As of October 2012[update], the most recent data sets are for 2010 and sometimes contain estimates. Accessed October 21, 2012.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
