Officials say a week-long search turned up no Asian carp south of Chicago where the invasive fish's DNA was discovered this fall.
Federal, state and local agencies said Tuesday that more than 800 fish were caught in nets during a search of a 5.5-mile stretch of the Cal-Sag Channel. But none were Asian carp.
The channel is part of a waterway network linking Lake Michigan with the Mississippi River basin.
Authorities announced in November that Asian carp DNA had been found in the channel north of an electronic barrier designed to prevent the carp from migrating into the Great Lakes.
Officials did find a single Asian carp during a fish-kill in another part of the canal last week, but it wasn't past the barrier.
The Cal-Sag Channel and Little Calumet River reopened to shipping traffic after the netting operation finished Monday.