Green sunfish. Anal fin has white/yellow border, and there is a white/yellow border on the tail fin as well. Large mouth. Blue/green markings on the cheeks/gills.
Not a rock bass b/c wrong color, wrong mouth.
Body is sort of colored like a sacramento perch or a warmouth, but the mouth shape and fin coloration rules them out. Also sac perch only exist in one or 2 ponds on the front range and I don't think we have warmouth.
Reply by: FishSeal Posted: 10/20/2015 10:11:29 AM Points: 3205
So, thanks to IFF who informed me of this post, and some research, regarding green sunfish and their potential hybrids... it is just a green sunfish.
There are reasons for it looking "odd" though, which are listed. 1) not spawning season when it is really easy to identify them. 2) it is probably an older specimen, which develop more of the black pigment. 3) the only other time I've seen black green sunfish was in a stagnant pond that that super clear water (not clean, just clear) and they were all black to blend in.
I have never fished McCall lake, but I would guess that there are more just like it.