Mercury Mystery, How Sinking Organic Matter Plagues Fish

The researchers discovered that up to 80 percent of the toxic form of mercury, methylmercury, is generated deep in the ocean, most likely by bacteria attached to sinking pieces of organic matter. Mercury found in Pacific fish near Hawaii likely traveled thousands of miles through the air before being deposited in the ocean, the team concludes, blaming industrial nations such as China and India that rely on coal-burning power plants. The U.S. Food and Drug Administration notes that large fish have the highest levels of methylmercury because they live longer and have more time to accumulate it.