Fish and mercury


If you catch fish from the wild, chances are good that they have mercury in their systems.

Scientists with the U.S. Geological Survey sampled 291 streams across the country. Every fish sampled in every stream was contaminated with mercury. About one quarter of them contained the metal at levels exceeding health standards established by the Environmental Protection Agency.

Mercury, a neurotoxin, is "one of the most serious contaminants threatening our nation's waters," the USGS said.


Some of the highest levels of mercury in fish were found in the tea-colored or "blackwater" streams in North and South Carolina,Georgia, Florida and Louisiana. High levels of mercury were also found in fish in relatively undeveloped watersheds in the Northeast and the Upper Midwest.


Scientists stopped short of saying that all waters are contaminated with mercury. But they pointed out that all 50 states have mercury monitoring programs, and 48 states issued fish-consumption advisories for mercury in 2006, the most recent year of national-scale reporting to the EPA.

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