White suckers have a long slender body with light brown colored sides and a white belly. They have a small sub-terminal (ending below tip of snout) mouth and smaller scales (55-85 along lateral line) than other sucker species, except the longnose sucker. The dorsal fin and tail fin are a slate gray color. All other fins are white, yellow, or a light brown. Breeding males have a rosy or pinkish stripe along their upper sides and a dark colored back. Young white suckers have dark blotches over their back and sides . White suckers differ from the closely related longnose sucker by having a shorter snout and fewer later line scales.