We got bunches of em here in IL too. They were introduced by accident during the big flood in the early 90's. Seems catfish farms used them to filter their ponds. Floods washed them into the rivers. I've had 20 pounders jump right in my boat. Heard of people getting broken noses and dislocated shoulders getting hit by the buggers. They put in a electric fish barrier in the upper Mississippi to try to keep them out of the big lakes. We bowfish for the nasty critters.