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What’s driving the Wisconsin walleye decline?

The study's lead author, Sarah Janssen, said that "If an angler is catching a walleye or something else offshore, and it fed near the contaminated zones, it's a potential that they have higher mercury and that mercury is from legacy contamination." (Minnesota DNR)

Researchers know Wisconsin lakes aren’t too warm for walleye, a cool-water fish, to survive. They suspect it’s a recruitment (surviving to maturity) issue that has more to do with food sources and what species has the competitive edge.

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