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University of Minnesota Professor Peter Sorensen discusses the newly operational underwater sound system designed to deter invasive carp Monday, Aug. 4, 2014, 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. ST.PAUL PIONEER PRESS/Dave Orrick

On Mississippi, invasive carp getting an earful from experimental 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 roughly 20 outboard motors — a sound unpleasant to humans, unnoticed by native fish, and super-annoying to invasive bighead and silver carp, so much so that they swoosh tail and swim back downstream, researchers hope.

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