I have only seen a couple of fish I thought could have been CNBGxRES hybrids, but I am not good enough at identifying fish to be sure they were. I just knew they looked different than most of my HBG or HRES.
The only reason I am reasonably comfortable identifying these HRES (RESxGSF) is that I have seen lots and lots of them come from a pond that they are the only possible hybrid because RES and GSF are the only sunfish in the pond
(my forage pond). Below is another RESxGSF that I caught out of my main pond yesterday. Lots of these hybrids were transferred from my forage pond as fingerlings and now they have grown. I return all of these particular hybrids to the pond to grow up because I am curious as to how they will turn out.