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Industrial fishing practices are increasing human exposure to methylmercury, a neurotoxicant associated with developmental delays in children and impaired cardiovascular health in adults.

New research from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), in collaboration with the University of Delaware and the University of British Columbia, finds that industrial fisheries that harvest tuna and other large fish in tropical and subtropical waters account for more than 70% of all methylmercury fished from the ocean.

The research, published in the Proceedings of the National Academy of Sciences, explores the complex interplay between biology, chemistry and the global seafood market.

Let's begin with the market.

The market for so-called large pelagic seafood, which includes tuna, has sharply increased in recent years, thanks in part to advances in industrial fishing such as onboard freezing and fish aggregating technology.

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