Lt. Gen. Thomas P. Bostick told the U.S. House Appropriations Subcommittee on Energy and Water Development that the invasive carp's advance has stalled south of an electronic barrier built in 2002 to keep them from the Great Lakes. "The point is, the leading edge of the Asian carp has not changed movement since 2006," Bostick said in response to a question from Rep. Marcy Kaptur (D-Toledo). "We don't know why they haven't moved" further upstream, he said.