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Biologists welcome mysterious zebra mussels retreat

Biologists say they don't know yet why zebra mussels disappeared from a 25-mile stretch of the St. Croix River. They think either turbulent water or hungry carp might be behind the sudden retreat of the invasive shellfish that displaces native species.
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Biologists say they don't know yet why zebra mussels disappeared from a 25-mile stretch of the St. Croix River. They think either turbulent water or hungry carp might be behind the sudden retreat of the invasive shellfish that displaces native species.

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