I'm a big fan of aquaponics too, but I've never seen numbers on the energy required to source, process, and transport the fish food. It gets even more complicat

I'm a big fan of aquaponics too, but I've never seen numbers on the energy required to source, process, and transport the fish food. It gets even more complicated if you include the energy required to raise the fish that get caught and turned into fish food. In my old system, I used bottle fly larvae to feed the fish so the energy input was less (waste refuse that would have been composted anyway) . It was the least fun part of the system because of the "gross factor" of maggots.