Those are longear sunfish(LES). LES are very common in smaller midwest rivers and creeks. They can survive in ponds, but don't do as well in them as some other sunfish species. They also tend to not get overly big. A 6" one is large and an 8" one is a giant. They are very colurful and make excellent aquarium fish... HBG are not very good in aquariums as you can see, they are insanely aggressive and will batter than tank mates to death.
