2008年06月17日

Fisheries Oceanography : A menace of ABASIA

 ABASIA is known as insects causing damage to crops which you should be careful to in surface of the sea culture.

 The wild salmon resources inhabiting the Canada coast area of the sea come under serious influence by infestant flowing out from a nursery. And the part of the salmon population faces a crisis of the extinction because the spread of such a parasitic worm is very strong.

AQUACULTURE
The price of lice

Wild salmon stocks in Canadian coastal waters are being severely affected by parasites from fish farms. So intense are these infestations that some populations of salmon are at risk of extinction.

The global demand for fish is on the rise, and farmed sources are talking much of the strain ― the catch of wild fish has levelled off off, and may well be declining (Watson,R.& Pauly, D. Nture 414,534-536/2001), but aquaculture production is expanding rapidly (Food & Agriculture Organization of the United Nations State of World Aquaculture 2006 Fisheries Tech. Pap. 500 - FAO, Rome, 2006).

The ecological costs of that expansion can be heavy, however, as Krkosek et al. show in Science(Krkosek, M. et al. Science 318,1772-1775/2007).

The message of their paper is that there are some serious issues that cannot be ignored if the expansion of a aquaculuture is to be productive rather than destructive.


Consmers can readlily see the shift to wards aquaculture, particuarly for products such as farmed salmon, which has become a staple of supermarkets and restaurants in Eourope and North America.

Those buying fish will be aware of press reports of overfishing and resource depletion.

Some may even look for eco-labels or carry a little card to guide them towards the purchase of sustainable products.

As my colleague Carl Safina has saud, "Give a man a fish and you have fed him for day. Give a man a seafood choice and card and you have made him impossible to dine with."


But aquaculture products tend to be subject to less public attention, even as issuesranging from habitat destruction to the effects of using wild fish to feed farmed stocks become of greater concern (Naylor, R. L. et al. Issues Ecol. No.8/2001).

The emphasis of aquaculture developent has, not surprisingly, been on increasing production, lowering costs and improving products.

Those needs of the industry have been well served by the science of fish farming.

Unfortunately, however, research pointing out the environmental costs of production has been vewed as an attack on the industry, rather than as a challenge to be tackled and overcome.


(...to be continue...)



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### DataBace ###
nature Vol 451 | Issue no.7174 | 1-106 | 3 January 2008
news and views p.23-24
AQUACULTURE : The price of lice / Andrew A. Rosenberg

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