Thousands of dead fish are washing up on the shores of Lake Erie and the cause of the deaths is unknown. Fish carcasses lie rotting in coves and on beaches. The stench has gotten so bad that it?s forced homeowners to keep their windows closed.

?It?s a very interesting mystery,? says Bill Culligan, an aquatic biologist who heads the Lake Erie Fisheries Research Station. Scientists are looking into whether a virus, bacteria, weather-related events or zebra mussels may be to blame.
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