Increased Bio-accumulated Mercury Detected in Great Lakes Fish

April 2017 News

Mercury. It’s poisonous, and it collects in fish when mercury-bearing pollutants get in the water from such sources as coal-burning smokestacks. In the Great Lakes, we have seen the levels of mercury in fish decline steadily since the environmentally motivated regulations of the ‘70s, but that isn’t the whole story.

In an article released yesterday for the Columbus Dispatch, Keith Matheny writes of a recent finding that the mercury levels in some Great Lakes fish are rising.

The mercury levels from the tested fish are still under EPA thresholds, and the effect is found in only certain regions of the Lakes, but the discovery shows the importance of continued vigilance in monitoring the health of the Great Lakes.  

Affecting Lake Erie walleye, Lake Michigan walleye and lake trout from Grand Traverse Bay, and Lake Huron walleye from Saginaw Bay and lake trout from Thunder Bay, the increased bioaccumulation of mercury has been noted on both sides of the border by both Canada’s Environment and Climate Change Canada and the United States’ EPA.

The finding shows that the Great Lakes still need care and attention to maintain our precious fresh-water resource.

Read the Columbus Dispatch article here.

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