So your post has led me to reading a ton about aquaponics for the last week. In doing so, I was reading about fish choices. Trout vs Tilapia vs Catfish, etc. It appears the pros of tilapia are that they of course are easy to care for and breed easily. The downside is that they apparently are the least nutritious of the choices and have a Omega fatty acid ratio that removes a lot of the benefit of eating fish. Have you read about this? If so, do you plan on trying other fish species later? Just curious.
Also, what are you using to contain the fish? Is it glass, a "tote" container type thing that's been reinforced externally, or something else? Just trying to get ideas!
I would think that some part of the decision as to which to raise would be whether or not the taste was palatable to you. I dont happen to be overly fond of trout or catfish. I can eat them occasionally but to raise them and make them a steady menu item would not work for me. However I don't have the means nor the physical ability to raise any at this time. My comment was meant only to give you something to think about.