Most supermarket tilapia comes from China. You don't even want to know.You could try okra or devil's claw, they both do well in the heat. Have you ever tried fruit trees? I've seen some in systems; dwarf peach, citrus, olive and pomegranate. These were grown in southern Cal. but those trees do grow here in the ground. I would think they should take to aquaponics.
Oh I've seen some bad growing conditions at tilapia farms here in the valley. Yuck! The meat from those fish can't taste right. Clean systems will make a difference.