A huge variety of fish, including cod, bream, mussels, salmon and sturgeon, is being farmed, providing food for people all over the world.

非常多的鱼类已被养殖，包括鳕鱼、鲤科鱼、贻贝、鲑鱼和鲟鱼，为世界各地的人们提供了食物。

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Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.

清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。

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Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.

鲑鱼在河流和海洋之间迁徙时也会携带危险的化学物质。

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The Food and Drug Administration says there would be no need for special labeling if the salmon is found to have the same basic contents as other fish.

VOA: special.2010.10.05

Right at the entry to the market, dozens of tourists crowd around its most famous attraction: a fish stand where the workers throw a salmon back and forth several meters over shoppers' heads.

VOA: standard.2010.07.14

Landcatch Natural Selection said the research could create the "perfect salmon" and revolutionise the fish farming industry.

BBC: Wild fish rod catches high, says Scottish government

But dams, diversions and recent drought have combined to push the spawning salmon population in the Klamath well below the 35, 000-fish threshold deemed necessary for the river to maintain a sustainable salmon population.

ECONOMIST: Saving the fish of the Klamath river

The Atlantic Salmon Federation, for example, fears the fish could get into the wild, start breeding and disturb the ecosystem.

BBC: Salmon steak from GM fish could soon be on your plate