State officials are cautioning South Dakota residents about mercury in fish from five lakes in the state. The state issues consumption advisories when test results show mercury levels higher than 1 part per million in fish. That is 10 times lower than the lowest levels associated with neurological damage from mercury poisoning, but officials still urge people who eat the fish to space out meals to guard against mercury accumulation. The advisory is in effect for northern pike over 25 inches from Coal Springs Reservoir in Perkins County; walleye over 23 inches from Reid Lake in Clark County; pike over 26 inches from Opitz Lake in Day County; pike over 18 inches from Newell Lake in Butte County; and pike over 24 inches from Lake Roosevelt in Tripp County.
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