On Mississippi, invasive carp getting an earful from experimental underwater speakers
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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