FILE - In this Jan. 12, 2010 file photo, Asian bighead carp swim in an exhibit at Chicago's Shedd Aquarium. The Army Corps of Engineers is studying whether to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. The flow of the river into the lake was reversed in the late 1800's to prevent pollution from reaching Lake Michigan. (AP Photo/M. Spencer Green, File)

Associated Press
FILE - In this Jan. 12,  2010 file photo, Asian bighead carp swim in an exhibit at Chicago's Shedd Aquarium. The Army Corps of Engineers  is studying whether to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. The flow of the river into the lake was reversed  in the late 1800's to prevent pollution from reaching Lake Michigan. (AP Photo/M. Spencer Green, File)
FILE - In this Jan. 12, 2010 file photo, Asian bighead carp swim in an exhibit at Chicago's Shedd Aquarium. The Army Corps of Engineers is studying whether to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. The flow of the river into the lake was reversed in the late 1800's to prevent pollution from reaching Lake Michigan. (AP Photo/M. Spencer Green, File)
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