banjocat;2633242; said:forgot round gobies. I catch them all the time in the Saginaw River and some other rivers. As someone else mentioned common carp are also exotics in the U.S. Have also seen a few sea lamprays. Almost caught a pike with one on it once. The pike broke my line and flopped back into the water. If you count zebra mussels, they are a big problem in Michigan
Those round gobies look pretty neat to bad illegal to sell,keep as neat looking hardy fish
One of the Oscars had strange under bite the others were normal but imagine born in wild few generations as drab colored as they were.