What Heppy said. Rainbow do really well in a pond environment, especially if you feed them. I enjoy them in the Texas winter! Even in Indiana, though, they will be put & take due to summer temps usually exceeding what they can survive.
Hybrid stripers are another interesting idea. Great fighters, though they don't jump.
If you really want to go exotic, could even consider one or two tiger musky. But they will eat your other fish, even pretty large ones.
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