Sharks feed at the apex of the marine food web. Researchers hope that measuring levels of methylmercury in sharks and tracking their migratory patterns will lead to a better understanding of toxicity throughout the marine food web and measures to control the flow of toxic substances into the Gulf.

Sharks feed at the apex of the marine food web. Researchers hope that measuring levels of methylmercury in sharks and tracking their migratory patterns will lead to a better understanding of toxicity throughout the marine food web and measures to control the flow of toxic substances into the Gulf.

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