In my sampling study of 2006, I collected fish from a closed, non-flow-through, very private access, 1/3 ac pond that I originally stocked with a low density of Hybrid Bluegill(18)(bluegill x green sunfish cross) and yellow perch(120) back in 1989. Predator fish has been SMB. Sampling by angling yielded 5 large HBG (8"-8.9")whereas various traps produced 25 small fish that I called green sunfish some of which are in the photo below.
There has been previous discussion and various opinions, some it from learned individuals, on this forum about what the resulting fish will be after numerous generations of HBG reproduction. My experience in this one pond is that after 16-17 years I am seeing green sunfish. I did not and have never caught any fish from this pond that I would call a bluegill; I occassionally catch HBG types but never a fish that has closely resembled a bluegill. The picture is not the best quality due to my photographing the fish in a laundry basket. If anyone wants better photographs of the small sunfish types from this pond I can easily get more photos this summmer.
