What's surprising, said an expert on pollution and sportfishing in California, is that a high altitude lake in Yosemite National Park would have a fish with such high mercury levels that it shouldn't be eaten at all.
"Unless there had been some historic mining up there or something, I am puzzled," said Bill Jennings, the executive director of the California Sportfishing Protection Alliance. "I would be curious as to what sort of historical activities occurred pre-park protection in the old Gold Rush era."
In many parts of California, as well as elsewhere, waste left from gold mining releases mercury into the environment. Mercury was used to process gold ore.
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