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University of Minnesota professor Peter Sorensen discusses on Monday the newly operational underwater sound system designed to deter invasive carp at Lock and Dam No. 8 on the Mississippi River south of La Crosse, Wis., in Genoa, Wis. The first-of-its-kind system cost $75,000 and plays the racket of about 20 outboard motors through five underwater speakers. (Dave Orrick / St. Paul Pioneer Press)

Invasive carp in Mississippi River will get an earful from underwater speakers

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GENOA, Wis. — Any invasive carp trying to swim up the Mississippi River through the shipping lock here will get an earful.

Five underwater speakers blare out the racket of about 20 outboard motors — a sound unpleasant to humans, unnoticed by native fish, and super-

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