Maybe catfish would be more marketable in Kentucky..
Not too many restaurants sell fried tilapis, and everyone likes fried catfish in the south....
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Just my take (I was born in California, Raised in Tennessee and lived in Europe).
Tilapia seems to be the aquaponics choice (because it likes warm water, just like the plants in the green house like it "not cold").
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But you don't have to keep the fish tanks in the same greenhouse as the grow beds. In fact, you can keep the fish tanks in the basement (for trout and maybe catfish you would need a skylight for some daylight - I used Solar Tubes. Got them at a bankruptcy liquidation auction, bought 24 for $150.00. Really cheap).
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You can buy mirror foil/plastic and roll your own semi perfect solar tube, just use a plexiglass bubble/skylight for the top and a cut to size fluorescent lamp diffused for the bottom lense. You will be simply amazed how well it will work.