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Is there methylmercury in all fish and shellfish?

April 26, 2017fish mercury methyl mercury methylmercury seafood shellfish young children

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Is there methylmercury in all fish and shellfish?

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Nearly all fish and shellfish contain traces of methylmercury. However, larger fish that have lived longer have the highest levels of methylmercury because they’ve had more time to accumulate it. These large fish (swordfish, shark, king mackerel and tilefish) pose the greatest risk. Other types of fish and shellfish may be eaten in the amounts recommended by FDA and EPA.