Other studies show that supplies of the krill-tiny Marine crustaceans-that fuel the Antarctic food chain also dropped during this period.

另外一些研究表明同期的磷虾数量也急剧下降。而这种小的甲克生物正式南极鲸的食物来源。

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The Marine Conservation Society says harvesting whitebait in large quantities reduces food supplies for other species - such as marine birds - in the food chain.

BBC: 7 questions on sustainable fish

Not satisfied with these results, the green lobby has prompted the National Marine Fisheries Service to further cut water supplies, in part to improve the conditions for whales and other species out in the ocean.

FORBES: America's Agricultural Angst