The Illinois Department of Natural Resources is asking hunters, anglers and others to help prevent an invasive snail from reaching Illinois rivers and streams.
The IDNR says the New Zealand mud snail has been found in a creek in Wisconsin and in other small streams in the Midwest.
In Illinois they've been found only in Lake Michigan.
Bob Wakeman works for the Wisconsin Department of Natural Resources. He says the mud snail can be "extremely prolific" and may be impacting fish populations in Western streams.
Wakeman says there's no good way to get rid of the snails, so efforts are focused on containing them.
The snails can be transported on boots, duck decoy anchors and boats. So anyone in or around Illinois waters should be on the lookout.