Illinois Department of Natural Resources personnel conduct electro-fishing operations in the Little Calumet River near the T.J. O'Brien Lock and Dam before Rotenone application during the multi-agency sampling operation here, May 20. The goal of the operation is to collect data and determine the possible population of the invasive species, Asian Carp. U.S. Coast Guard is enforcing a safety zone for the duration of sampling operations. (U.S. Coast Guard photo/Lt. David French)