The monthly patterns of ovarian developmental stage and the mean GSI±standard error wereinvestigated for the size classes that could attain vitellogenic oocytes at 1-cm BLintervals as follows:7£BL<8 cm, 8£BL<9 cm, and so forth. Individuals of BL≥12 cm were defined as a single size class, because of the small sample size for theindividuals of BL>13 cm. Size at first maturity was defined as the smallest size class at which more than 50% of individuals attained vitellogenicoocytes in the ovary.
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