I've discovered that instead of the 300 gallon fish tank I was planning for my aquaponics system (stocked with catfish), my wife is more comfortable with a 150-170 gallon tank due to the large footprint required for the larger tank. So I've been researching fish for my smaller tank. I want to maximize fish for the space. I've received many suggestions for bluegill, so I did a little research via Google. Surprise, surprise....bluegill are being researched as a lower cost alternative to tilapia for commercial sales. I would prefer a native fish to tilapia anyway, so besides catfish, blueguill are sounding more and more attractive. They seem to be pretty hardy and tolerant.
Here's an article from my native state that I ran across tonight: http://www.columbiamissourian.com/stories/2010/01/15/bluegill-fish-...
Now if I can just grow them out to 1 lb in my aquaponics system, I'll be a very happy man.