Plasma levels of C-18-, C-19- and C-21-steroids in captive and feral female sea bass

• Type: Article in International Scientific Journal
• Date: 1999

Authors

rocha, mj (Author) Other; reis-henriques, ma (Author) Other

Journal

Title: Journal of Fish Biology

Vol. 55

Pages: 26-34

ISSN: 0022-1112

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

Scientific classification

FOS: Agrarian Sciences > Agriculture, Forestry, and Fisheries

Other information

Authenticus ID: P-001-3Z9

DOI: 10.1111/j.1095-8649.1999.tb00653.x

Abstract (EN): Morphometric analysis of the gonads of sea bass Dicentrarchus labrax revealed that captive fish matured I month later than feral fish, but levels of gonadal steroids were identical in both groups at the same stage of sexual development. 17 beta-oestradiol (E-2) (up to 3 ng ml(-1)) and testosterone (T) (up to 4 ng ml(-1)) were highest during the gametogenetic period while 17,20 beta,21-trihydroxy-4-pregnen-3-one (17,20 beta,21-P) (free and sulphated) were maximal during the spawning period. Free 17,20 beta-dihydroxy-4-pregnen-3-one (17,20 beta-P) was very low and did not change (c. 0.5 ng ml(-1)) while 17,20 beta-P-sulphate increased during the spawning period in both groups (up to 2 ng ml(-1)). In contrast cortisol levels were higher in captive fish and increased during the spawning period (up to 100 ng ml(-1)). These results suggest that captivity delays vitellogenesis and spawning in sea bass without affecting the final levels of the gonadal steroids and further indicates a role for cortisol in the latter period. The increased levels during the spawning period suggests a pheromonal role for 17,20 beta-P-sulphate and 17,20 beta,21-P-conjugates and the involvement of 17,20 beta,21-P in final ooccyte maturation. (C) 1999 The Fisheries Society of the British Isles.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9