Abstract
Androgens and estrogens were assayed by radioimmunoassay (RIA) technique in serum of bluefish, Pomatomus saltator, and king mackerel, Scomberomorus cavalla. Both species were collected in the northeast Gulf of Mexico from August through November 1979. When categorized by stage of ovarian development a significant correlation between gonadosomatic indices (GSI) and serum estrogens was observed among female S. cavalla but not among P. saltator. Among males and females of both species, a significant correlation between GSI and serum androgens occurred. Peak levels of androgens in male king mackerel (38.12 ± 11.21 ng/mL) were not significantly different from peak levels of females (33.14 ± 5.10 ng/mL). However, in female bluefish, androgens peaked at 3.68 ± 0.88 ng/mL, twofold greater than in males (1.66 ± 0.28 ng/mL). Following this peak, a significant reduction in androgens occurred in ripe female bluefish. No significant change in estrogens occurred in these females. Although the functional significance of changes in androgens in spawning female bluefish was not determined, serum androgen levels may be a useful tool in identifying and timing maturation and spawning in both male and female teleosts.
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