In my main 3 acre pond I think I get very little hybridization. The way the hybrids get there are from my sediment pond above it. In the sediment pond there are periods of turbidity and large inflows of water. There are also GSF which seem to tolerate severe conditions a lot better than other more desirable fishes. Could explain why the vast majority of sun fish in local creeks and streams are GSF. Very few BG caught. At least that is the way it was as a kid. Hardly fish anything other than my pond now. We used to call GSF other names when I was a kid simply mistaking fish in spawning colors by their coloration. We didn't know how little we knew.
So my sediment pond seems to be good conditions for the hybridization to occur. As I fish it to cull fish I still get a number of HBG YOY from the catch. Much smaller numbers of the RESxGSF but really hard to tell when fish are small. Most of my RESxGSF hybrids come from my forage pond where there are no BG present.
PBF Sept 22, 2018 get together