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Stress-induced changes in concentrations of plasma sex steroids in black bream
journal contributionposted on 2023-05-16, 11:44 authored by James HaddyJames Haddy, Pankhurst, NW
Cortisol levels of black bream Acanthopagrus butcheri at capture did not change with time of day, gonadal stage or season and were 1Â·9 Â± 0Â·2 and 2.8 Â± 0.4 ng ml -1 for male and female fish, respectively. Confinement resulted in significantly elevated cortisol levels at all time periods; however, levels after 24 h of confinement were significantly lower than peak cortisol levels (15 min for males and I h for females). Confinement stress resulted in reduced levels of 17Î²-oestradiol (E2) and testosterone (T) within 1 h in sexually mature females. In mature males, suppression of T and 11-ketotestosterone (11KT) occurred after 30 min and 6 h of confinement, respectively. The relationship between confinement stress and levels of 17,20Î²-dihydroxy-4-pregnen-3-one (17,20Î²P) was more complex, with levels in males being elevated after 15 min and 24 h and suppressed after 6 h of confinement. In contrast, 17,20Î²P levels in females were elevated after 1 h of confinement. In regressed females, plasma E2 and T concentrations were low at capture and were not affected by confinement stress whereas plasma 17,20Î²P was elevated within 1 h. This study indicates that stress exerts a rapid inhibitory effect on gonadal steroidogenesis.
Publication titleJournal of Fish Biology
Department/SchoolInstitute for Marine and Antarctic Studies
Place of publicationLondon