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Stress-induced changes in concentrations of plasma sex steroids in black bream

Citation

Haddy, JA and Pankhurst, NW, Stress-induced changes in concentrations of plasma sex steroids in black bream, Journal of Fish Biology, 55, (6) pp. 1304-1316. ISSN 0022-1112 (1999) [Refereed Article]

DOI: doi:10.1111/j.1095-8649.1999.tb02077.x

Abstract

Cortisol levels of black bream Acanthopagrus butcheri at capture did not change with time of day, gonadal stage or season and were 1·9 ± 0·2 and 2.8 ± 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 17β-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 17,20β-dihydroxy-4-pregnen-3-one (17,20βP) was more complex, with levels in males being elevated after 15 min and 24 h and suppressed after 6 h of confinement. In contrast, 17,20βP 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 17,20βP was elevated within 1 h. This study indicates that stress exerts a rapid inhibitory effect on gonadal steroidogenesis.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Comparative Physiology
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Haddy, JA (Dr James Haddy)
Author:Pankhurst, NW (Professor Ned Pankhurst)
ID Code:16549
Year Published:1999
Web of Science® Times Cited:51
Deposited By:TAFI - Aquaculture
Deposited On:1999-08-01
Last Modified:2011-08-04
Downloads:0

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