Unlike other members of this family, the Green Sunfish has a wider body and much larger mouth. Each scale is flecked with yellow or emerald green. Their back and sides are olive-green, and lower belly is yellowish-copper or brassy. Their body is short, stocky, and deeply compressed from side to side and the gill cover has a broad, light margin and it often has a black spot on the rear flap. The gill cover bone is stiff all the way to the margin which is different from most other sunfish.