The river redhorse, Moxostoma carinatum (Cope), is a Catostomid fish of east-central North America. In rivers where it is common, the river redhorse frequently affords a sport fishery, especially during its spawning period. During the period July, 1966, to July, 1968, 339 river redhorse were collected from the Cahaba River, Alabama. Scales from 183 of these specimens were aged and back calculated. An additional 52 pondreared specimens were utilized for scalation and length-weight studies. Length-weight equations were computed. Female river redhorse were significantly heavier than males throughout the data ranges studied. Male river redhorse from the Cahaba River were greater in length at age groups I, II, III, and IV than were females. Specimens from the Duck River, Tennessee, grew more slowly than those from the Cahaba River although larger sizes were reached in Duck River.