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Shrimp fishery

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Title: Shrimp fishery  
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Subject: Dendrobranchiata, Marine shrimp farming, Shrimp, Trepanging, Chinese white shrimp
Collection: Caridea, Dendrobranchiata, Fisheries
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Shrimp fishery

Shrimp trawler

The shrimp fishery is a major global industry, with more than 3.4 million tons caught per year, chiefly in Asia. Rates of bycatch are unusually high for shrimp fishing, with the capture of sea turtles being especially contentious.

Contents

  • Nomenclature 1
  • History 2
  • Scale and distribution 3
  • Controversies 4
  • Species targeted 5
    • Paste shrimp fisheries 5.1
    • Warm-water fisheries 5.2
    • Cold-water fisheries 5.3
  • See also 6
  • Notes 7
  • References 8
    • Bibliography 8.1

Nomenclature

The term "shrimp", as used by the shrimp (Caridea) and prawns (Dendrobranchiata, comprising Penaeoidea and Sergestoidea) – a group formerly known as "Natantia".[1] This nomenclature often differs from local use, in which the same species may be known by different names, or where different species may be known by the same name.[2]

History

Small-scale local fishery for shrimp and prawns has existed for centuries and continues to form a large proportion of the world's shrimp fisheries.[3] Trawling increased in scale with the introduction of otter boards, which use the flow of water to hold the trawling net open, and the introduction of steam-powered vessels, replacing the earlier sail-powered boats.[3] Both of these developments took off in the 1880s, and were soon applied to shrimp fisheries, especially following the research effort of the Norwegian marine biologist Johan Hjort.[3] Over time, the original open skiffs, 5–8 metres (16–26 ft) long, were replaced by decked boats, to which diesel engines were added, allowing the boats to reach an average of 18 m (59 ft).[4]

Scale and distribution

In the United States, shrimp and prawn fisheries are second only to

  • Doeksen A (2006) "Ecological perspectives of the north Sea C. Crangon fishery: An inventory of its effects on the marine ecosystem" Thesis, Wageningen University.
  • R. Gillett (2008). Global Study of Shrimp Fisheries. Rome, Italy:  
  • H. O. Hillestad, J. I. Richardson, C. McVea & J. M. Watson (1982). "Worldwide incidental capture of sea turtles". In Karen A. Bjorndal. Biology and Conservation of Sea Turtles. Proceedings of the World Conference on Sea Turtle Conservation, Washington, D.C., 26–30 November 1979. Washington, DC:  

Bibliography

  1. ^ Gillett (2008), p. 5.
  2. ^ a b Gillett (2008), p. 26.
  3. ^ a b c Gillett (2008), p. 9.
  4. ^ Gillett (2008), p. 10.
  5. ^ a b Gillett (2008), p. 19.
  6. ^ Gillett (2008), p. 41.
  7. ^ a b c Gillett (2008), p. 46.
  8. ^ (1982)et al.Hillestad Cited in Gillett (2008), p. 50.
  9. ^ Based on data sourced from the FishStat database
  10. ^ Gillett (2008), p. 25.
  11. ^ a b c d e f Gillett (2008), p. 27.
  12. ^ Gillett (2008), p. 118.
  13. ^ Gillett (2008), p. 85.
  14. ^ Gillett (2008), p. 47.
  15. ^ Gillett (2008), p. 49.
  16. ^ Gillett (2008), p. 28.
  17. ^ Gillett (2008), p. 38.
  18. ^ Gillett (2008), p. 52.
  19. ^ a b c Gillett (2008), p. 60.
  20. ^ Gillett (2008), p. 53.
  21. ^ Gillett (2008), p. 55.

References

  1. ^ The FAO divides fisheries into "species items", which are typically species, but may be genera or higher taxa.
  2. ^ a b "nei"=not elsewhere included.
  3. ^ Excluding the catch-all category "Natantian decapods nei".

Notes

See also

Fisheries for cold-water shrimp using pots, the bycatch is mostly of invertebrates, including squat lobsters, crabs, molluscs and echinoderms.[21]

Bycatch is typically managed in cold-water shrimp trawling, and rates of bycatch are accordingly low,[7] and the capture of sea turtles is rare in cold temperate waters.[18] Bycatch is mostly reduced by the use of Nordmøre grids,[19] which reduce the numbers of cod, haddock, Greenland halibut and redfish caught during shrimp trawls.[20] The Nordmøre grid was invented by the Norwegian fisherman Paul Brattøy, primarily as a means of excluding jellyfish from shrimp catches, and introduced in 1989.[19] This innovation causes a minimal reduction in the quantity of shrimp caught, but can reduce the amounts of bycatch by around 97%.[19]

The most important cold-water species is the "northern prawn", Pandalus borealis,[11] which accounts for 12% of the total shrimp and prawn catch.[16] Up to 70% of the catch is landed in Canada and Greenland.[11] The price of cold-water shrimp has been in decline since the 1990s, as a result of increased shrimp farming.[17]

Pandalus borealis, the most important cold-water shrimp species

Cold-water fisheries

Warm-water shrimp and prawn fisheries usually target several species,[12] and are typically monitored in terms of the catch per unit effort (CPUE), rather than the complex models used for cold-water shrimp.[13] Warm-water species (mainly Penaeus setiferus, Penaeus aztecus, and Penaeus duorarum) provide more than 85% of the shrimp fishery in the United States, and are caught in the Gulf of Mexico and adjacent parts of the Atlantic Ocean.[14] Bycatch is a serious problem for warm-water shrimp fisheries, with inadvertent catches of sea turtles being among the most contentious issues.[15]

Warm-water fisheries

Although the various species of the genus Acetes are not always distinguished by fishermen, collectively they form the world's largest shrimp fishery.[11][Note 3] There are fisheries for Acetes in Korea, Japan and Southeast Asia, but the vast majority of the catch is in China.[11] The total catch is likely to be grossly under-recorded, but was estimated at 664,716 t in 2005.[11] Within the Asia–Pacific region, the Acetes fishery is the fourth largest fishery by weight, after hairtails, anchovies and scads.[11]

Paste shrimp fisheries

Shrimp and prawn fisheries can be divided into cold-water, warm-water and paste shrimp fisheries, broadly corresponding to the three taxonomic categories Penaeoidea, Caridea and Sergestoidea, respectively.[2]

Scientific name FAO name 2005 catch (t) Percentage of total
N/A Natantian Decapoda nei[Note 2] 887688 26.0%
Acetes japonicus Akiami paste shrimp 664716 19.5%
Trachysalambria curvirostris southern rough shrimp 429605 12.6%
Pandalus borealis northern prawn 376908 11.0%
Penaeus spp. Penaeus shrimp nei[Note 2] 230297 6.7%
Penaeus monodon giant tiger prawn 218027 6.4%
These are given in the table below: [10] which collectively account for 82% of the global catch.[Note 1] are of commercial importance, out of a total of 3000 species. The catch is dominated by six "species items",prawns and shrimpFewer than 300 species of
Global capture of wild shrimp and prawn species in million tonnes, 1950–2010, as reported by the FAO[9]

Species targeted

Shrimp fisheries produce unusually high levels of bycatch. Before the introduction of bycatch reduction devices in the 1980s, shrimp fishery had a bycatch ratio (ratio of the amount of non-target species caught to the amount of the target species caught) of 4.5–5.3:1.[7] Since BRDs were introduced, the bycatch ratios may have been reduced by as much as 30%.[7] Shrimp fishing is likely to "capture more sea turtles than any other commercial fishery".[8]

Controversies

[6]

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