Sectioned sagittae of 1,039 Spanish mackerel, Scomberomorus maculatus (Mitchim, from the Atlantic coast of the southeastern United States (North Carolina to Florida) were examined. The oldest male was age 6 and the oldest female age 11. Marginal increment analysis indicated that annulus formation peaks in May-June. The von Bertalanffy growth equation parameters (L_, k, and to' respectively) were: 538mm fork length <FLJ, 0.31, and -2.31 for males; 723mm FL, 0.24, and -1.80 for females; and, 760mm FL. 0.18. and -2.44 for sexes combined. Gonads from 1,742 specimens were examined histologically to assess reproductive state. Mature gonads were present in 89% of age-O males and 100% of older ages, whereas 5% of females were mature at age 0, 95% at age 1, and 100% at older ages. Females matured at 88450mm FL and males matured at 209-336mm FL. Estimates of length at 50% maturity (Lso) were 35.8 cm FL for females and 23.9 cm FL for males. Females were in spawning condition from May to August; ripe males were captured April November. Resting specimens were included in the assessment of maturity and the disadvantages of their inclusion are discussed.