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Mercury levels accumulating in Lake Clark NP&Pres fish populations

Mercury is a metallic element that that is present in elevated levels in some lakes in southwest Alaska. It can build up in fish that live in these lakes year-round. Then as birds, people, and other animals dine on fish from those lakes, mercury can make its way up the food chain. The National Park Service and the United States Geological Survey are among the agencies that study mercury levels in southwest Alaska’s lakes in order to better understand mercury’s effect on ecosystems and how it gets there.

In 2005, the National Park Service began monitoring mercury levels in non-migratory lake fish in Katmai National Park and Preserve and the Lake Clark National Park Preserve.


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