Percopsis omiscomaycus

The trout-perch has been found at sizes of 20.0 centimetres (7.9 in) total length and the average total length is 8.8 centimetres (3.5 in). There are no distinguishing characteristics between males and females. They are overall silvery or nearly transparent in appearance with rows of dark spots on along the sides of their bodies both along their lateral line and above it. Their fins are almost entirely transparent. These fish have thick bodies with a long head, long snout, and a small mouth. They have a single dorsal fin containing 1–3 spines and 10–11 soft rays. They also have an adipose fin, similar to trout, which helps to distinguishes them from their look-alike species, the yellow perch and the walleye. Their tail or caudal fin is forked. Like most bony fishes, the trout-perch has thin, flexible plates of bone or leptoid scales. Their particular leptoid scales are ctenoid scales that are similar to the perch's.