Agree with Theo. I have an acre pond in Nebraska with smallies, yellow perch, wiper, redears, golden shiners and hybrid bluegill. In the process of removing walleye as they're the only species not really looking healthy when caught. And bluegill somehow managed to get in at some point. We've only caught 2 in the last 2 years, so not overly worried about it. Just fish it regularly and remove all you catch. And trapping is good too.