It took me a second to figure out what you were talking about with "cats" but I'm assuming you are referencing the HBC? I may have got the acronym wrong but what I was referencing was Hybrid Black Crappie.

I like the idea of a pond that can sustain itself, at least somewhat, and that's why I am still considering non-hybrid bluegill. What I fear is that with HSB and Hybrid Crappie being my predators, will the limited gape of those species cause an overpopulation of stunted BG due to their odd shape. Any opinions from anyone with experience on if HSB and HBC can keep a BG population from stunting?