http://wiscfish.org/ GSF
Mouth and snout: Mouth Terminal, large and oblique, with pads of small teeth on the jaws. No barbels. Body patterning, color, and scales: Back dark brown, olive, or green, sides yellow-green or blue-green, belly tan or yellow. Sides either with a more-or-less solid color, faint dark blotches or mottling, irregular faint light blue or yellowish SPOTS, and/or diffuse dark vertical bars. Sometimes 3-5 bluish lines radiating backward from underneath the eye; opercular flap dark with a light margin. Dorsal, caudal, and to a lesser extent anal fins usually darkly pigmented with faint dark blotches or light dark spots and often a light yellow/cream margin; pelvic and pectoral fins lightly pigmented to dusky. 44-51 ctenoid lateral scales. Body shape and size: Body laterally compressed and deep, somewhat elongated; oval in cross section. Typically 75-150 mm (3-6 in) TL; maximum in Wisconsin about 250 mm (10 in).
Tail, dorsal and other fins: Slightly Forked or round tail. Dorsal fin with 2 lobes, broadly joined by a membrane and appearing as one fin, the first with 9-11 spines and the second with 10-12 rays. Pelvic fins thoracic. Adipose fin absent. Anal fin with 3 spines and 9-10 rays.
GSF There are 9-12 short and thick primary gill rakers on the 1st arch.
BG
BG There are 13-16 moderately long primary gill rakers on the 1st arch.
HBG
Hybrid of green sunfish X bluegill: Notice intermediate appearance of gill rakers
These should help
GSF
GSF gill rakers
HBG
HBG (Bg x GSF) gill rakers
PS X BG
PS X BG close up
PS X BG gill rakers
GSF X BG gill rakers
PS gill rakers - short and thick 9-12.
PS X GSF
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