Black carp
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Indigenous to China, the black carp is a voracious fish, which is used in aquaculture across the American South to control disease. The black carp grows to a length of up to three feet (1 m), and over 70 pounds (32 kg), generally feeding on snails and mussels. State aquaculture laws require the carp to be bred sterile and kept in captivity. In thirty years of widespread usage by aquaculture firms across the south, the United States Fish and Wildlife Service has reported three individual black carp caught in the Mississippi River. There are also currently unsubstantiated claims of individual black carp having been caught along the Ohio River and Red River in the United States.
The U.S. Fish and Wildlife service has not listed the black carp as an "injurious species," although an effort is currently underway to add the black carp to the injurious species list found in the Code of Federal Regulations.