Bad News, Sorry tell you guys but its too late. They are already there and there is no way to eliminate them besides wiping out every fish and starting from scratch. If you think any barrier (bubble fence, Sound barrier etc..)will work then you are mistaken, if you are counting on the State of Feds to save you then you are crazy.
I am a Mississippi, Illinois, and Kaskaskia river fisherman here up north of you guys and they've been here for 15 years, they came quick. if you think its bad now then wait a year or two. Every Crappie fishery I fish has suffered some. it will not get better. The only positive is that the Catfish love them and they make great cut bait. I wish I had better news for KY anglers but boys it only gonna get worse.
The feds are only worried about saving the great lakes. they could care less about the rivers and impoundments. The fish have been on the loose since the flood of 1993 and they haven't been able to stop them since. Its time to be realistic. There Is a reason why all the big crappie up here are caught in lakes not connected to said rivers.