| Mercury level rises in Lake Erie walleye | |
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May 21 2010
Mercury levels in Lake Erie walleye appear to be increasing after two decades of steady decline, Canadian scientists said. The researchers analyzed 5,807 fish samples collected from the Great Lakes between the 1970s and 2007. Mercury levels in the fish steadily declined from the mid-1970s to 2007 in the upper Great Lakes of Superior and Huron and leveled-off in Lake Ontario walleye between 1990 and 2007, said Satyendra Bhavsar, a researcher with the Ministry of the Environment in Ontario. |
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