An intensive search has turned up no additional Asian carp in a Chicago-area waterway system – where one of the powerfully invasive fish  was found recently.

The discovery of a live silver carp on June 22nd – about 14 kilometres  from Lake Michigan –  raised fears that Asian carp might be evading an electric barrier – built to keep them out of the Great Lakes.

The discovery triggered a hunt by commercial fishers and crews – with U.S. federal and state agencies using nets and devices that stun fish – so they can be caught and examined.

The search covers a 21 kilometre area and will continue through July 7th.

The silver carp has been sent to Southern Illinois University for further clues as to where it came from.