Tilapia are bulletproof and all, but wouldn't it be great to grow a good tasting aquaponic fish? Hell yeah!
My business partner is very interested in growing the pacu fish, a kind of vegetarian piranha. They grow fast, are omnivorous, and supposedly very tasty.
I don't care for Pacu. I've had it twice, and I'm not sure I'll ever have it again. Pacu are very fast growers, but they require very warm temps for good growth, and their fatal temp levels are quite a bit higher than tilapia. Pacu also tend to be incredibly difficult to breed without extremely large, well-equipped facilities.