An analysis of age, growth, and fecundity was carried out on 208 quillback (Carpiodes cyprinus) and 32 highfin (C. velifer) carpsuckers collected from Four Mile Creek, Ohio, May-October, 1972. Back-calculations of growth indicated that C. cyprinus grows more rapidly than C. velifer, reaching its maximum size at age X. Males in both species were generally larger than females at each annulus, though the actual differences in length and weight were highly variable. The respective length-weight relationships for C. cyprinus and C. velifer were, respectively: log W = -4.06042 + 2.78559 log TL; and log W = -4.05206 + 2.80837 log TL; where W = wet weight (g) and TL = total length (mm). Monthly (May-October) condition coefficients for C. cyprinus ranged from 1.13 to 1.37 for males and 1.20 to 1.24 for females. Values for C. velifer (ages IV-VIII) ranged from 1.24 to 1.39.