Thanks to Frank Herd for this tip.
Article by DINA CAPPIELLO – August 19, 2009
(AP) WASHINGTON — A federal study of mercury contamination released Wednesday found the toxic substance in every fish tested at nearly 300 streams across the country, a finding that underscores how widespread mercury pollution has become.
The study by the U.S. Geological Survey is the most comprehensive look to date at mercury in the nation’s streams. From 1998 to 2005, scientists collected and tested more than a thousand fish from 291 streams nationwide. While all fish had traces of mercury contamination, only about a quarter had levels exceeding what the Environmental Protection Agency says is safe for people eating average amounts of fish.
“This science sends a clear message that our country must continue to confront pollution, restore our nation’s waterways, and protect the public from potential health dangers,” Interior Secretary Ken Salazar said in a statement.
Mercury can damage the nervous system and cause learning disabilities in developing fetuses and young children. The main source of mercury to most of the streams tested, according to the researchers, is emissions from coal-fired power plants. The mercury released from smokestacks rains down into waterways, where natural processes convert it into methylmercury — a form that allows the toxin to wind its way up the food chain into fish.