If you ran it as a business, I guess that you would need to grow appropriate good cash crops too. - more income with very low additional costs.
I think that I read that some of the available fish are vegetarian? If so, can you grow their feed as part of the system?
With the size limitations for my system here, I will not be able to grow much. A few square meters at most. If I stick with Tilapia, they are easy to feed. I can give them black soldier fly larvae, duckweed, or commercial fish feed. I want to give them more natural feed, though.
Edited by Paul, 17 June 2016 - 10:49 PM.