There is also the option of hybrid red ear. My fish supplier offers them, and I believe they are similar in reproduction to hybrid bluegills. Red ears, I believe, are not as prone to overpopulation as bluegills, but I think you'd still need some kind of predator. I am very impressed with their growth. I observed some yesterday in the shallows, and their growth in my pond has eclipsed that of the hybrids.
