Fish - Number One Cause of Mercury Poisoning in U.S.

In a new study conducted by the U.S. Geological Survey (USGS), every single fish tested from 291 freshwater streams across the United States was found to be contaminated with mercury.

"This study shows just how widespread mercury pollution has become in our air, watersheds and many of our fish in freshwater streams," said Interior Secretary Ken Salazar.

Mercury is a potent neurotoxin that builds up in the food chain at ever higher concentrations in predators such as large fish and humans. It is especially damaging to the developing nervous systems of fetuses and children, but can have severe effects on adults, as well. The pollutant enters the environment almost wholly as atmospheric emissions from industrial processes, primarily the burning of coal for electricity. It then spreads across the plant and settles back to the surface, eventually concentrating in rivers, lakes and oceans, where it enters the aquatic food chain.

The number one cause of human mercury poisoning in the United States is the consumption of fish and shellfish.

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Chicago Canal Poisoned to Keep Invasive Carp Out of Great Lakes

From the Environmental News Network:

CHICAGO -- State and Federal agencies have begun poisoning a nearly 6-mile stretch of the Chicago Sanitary Ship Canal to kill off invasive Asian carp while maintenance is performed on an electrical barrier intended to keep the fish out of Lake Michigan. The Lake’s ecosystem is already irreparably damaged by invasive species making the introduction of these new invasive fish a dire threat to the entire Great Lakes system. The fish can grow to 100 pounds in size and out-compete native species in an ecosystem due to their prolific breeding and ability to filter feed 40% of their body weight on a daily basis. Underscoring the threat, Governor Jennifer Granholm of Michigan today called for the re-opening of a nearly century-old case sitting before the U.S. Supreme Court regarding the Chicago Diversion to force immediate action around the carp issue. Read more here: http://www.enn.com/wildlife/article/40780