A logistic curve was fitted to the proportion of mature females by length: P = 1/{1 + exp[(−0.21)(EFL − 194.9)]} (r2= 0.65; n = 62; 5-cm classes) and the size-at-50% maturity estimated for female black marlin was 194.9 ± 5.95 (mean ± S.E.) cm EFL (Fig. 9), and the small-est observed mature female was 193.5 cm EFL. The size-at-95%maturity was 209 cm EFL and immature females were significantly smaller than mature females (t-test, t = 130.24, df = 441, p < 0.01).