Cylindrical in body form, the Sauger has a large horizontal mouth and well-developed pointed teeth. The back and top of the head are mottled brown to golden olive, the lips are less mottled and appear distinctly speckled, and the lower sides and venter are white or light cream. Four dark saddles traverse the back and may be expanded along the sides to produce large lateral blotches, while the back and sides are variously speckled with pigment. The lining in the eye behind the retina appears silver, a trait characteristic of the genus and presumably an adaptation for night feeding. Membranes of the spiny dorsal fin have distinct spots that sometimes appear to be banding, while the soft dorsal fin and caudal fin rays are definitely pigmented, producing delicate banding. The Sauger can be distinguished from the walleye, by its fewer (17 to 20) soft dorsal rays (19 to 22 for the walleye), by lacking a pigment concentration at the spiny dorsal fin base, and by having the lower lobe of the caudal fin mottled, compared to a white tip for the walleye. Adult size: 10 to 18 inches.