CHICAGO - A commercial tow operator escorts a recreational pleasure craft in along-side tow over the electric fish barrier on the Chicago Sanitary Ship Canal in Chicago Tuesday, Aug. 25, 2009. The Army Corps of Engineers constructed the barrier, which operates at two volts per inch, to disperse the invasive specie Asian carp. (U.S. Coast Guard photo/Petty Officer 2nd Class Bill Colclough)
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