Deep-bodied minnow, back greenish-olive with a faint dusky stripe along the midline. Sides are golden or silvery, and the belly is silvery white. Has a fleshy “keel” along midline of the belly from the anus forward to the pelvic fin bases. One of the largest minnows native to Missouri and the only minnow with a fleshy keel. The tail fin of breeding males is often orange-red.