Farmed Atlantic salmon was sometimes labeled at "wild salmon," researchers found when the tested seafood sold in New York City. iStockphoto.com hide caption

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A Tokyo sushi restaurant displays blocks of fat meat tuna cut out from a 269kg bluefin tuna. Yoshikazu Tsuno/AFP/Getty Images hide caption

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A fishmonger prepares her wares at the Sydney Fish Market. Brendon Thorne/Getty Images hide caption

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An oyster shucker on Samish Island, Wash. on Puget Sound. The state is frequently forced to close beaches to oyster gatherers because of the risks of harmful algae blooms. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP