Young bighead carp swim in a tank in La Crosse, Wis., where scientists with the U.S. Geological Survey are trying to develop a poison pill to kill the invasive species.

Young bighead carp swim in a tank in La Crosse, Wis., where scientists with the U.S. Geological Survey are trying to develop a poison pill to kill the invasive species.

( Chris Walker / March 20, 2012 )

Young bighead carp swim in a tank in La Crosse, Wis., where scientists with the U.S. Geological Survey are trying to develop a poison pill to kill the invasive species.

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