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Lake Winnebago Fish Kill Cause Unclear

The DNR says it does not know what is causing a recent fish kill on Lake Winnebago. Samples of dead fish at Lakeside Park here in Fond du Lac are being tested – as scientists work to see if the problem is viral or bacteria-based. Similar problems have appeared in the past due to low oxygen levels. DNR and Oshkosh fire officials claim the runoff from an industrial fire on Monday is not what is killing the fish. Results from the tests should be available within the next week.