State Wildlife experts from Ohio and Michigan and the U.S. Fish and Wildlife service say three-day sweep of western Lake Erie turned up no trace of the Asian carp. Officials used boats to net and stun fish at 58 sampling sites in the Maumee and Sandusky bays. The sweep was triggered by tests last month that detected the DNA of two species in the bays. Authorities from federal and state governments have spent more than 100 million dollars on efforts to keep the carp out of the Great Lakes, in order to protect the multi-billion dollar fishing industry.