I know this thread is a bit old  :oops:  but I was searching for info on this aquaponics thing. 
Does anyone know what fish are being used by that commercial place? Do they need a permit? 
I know everyone said you can't keep trout, I wondered if perch would be ok? 
Seems a shame to go to all the effort if you can't eat the fish in the end, and I understand perch are the best eating of the 'course' fish.