University Of Tasmania

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Steroid hormone levels and bi-directional sex change in Gobiodon histrio

journal contribution
posted on 2023-05-16, 14:02 authored by Kroon, FJ, Munday, PL, Pankhurst, NW
Sex change in the coral-dwelling goby Gobiodon histrio was induced by placing two adult fish of the same sex on a coral colony. The sex change of individual fish was confirmed using histology, and whole-body concentrations of the gonadal steroids testosterone (T), 11-ketotestosterone (11-KT), and 17β-oestradiol (E2) were examined. The results show that T, 11-KT and E2 occurred in both female and male G. histrio. E 2 concentration in females was twice that in males, while concentrations of T did not differ between the sexes. Contrary to predictions, concentrations of Tand E2 did not differ between fish that changed sex and those that did not. Most samples had 11-KT concentrations below minimum levels of detection (i.e. <0.15 ng ml-1) and were therefore not analysed statistically The results suggest that: (i) specific activation or de-activation of theT-E2 (aromatase) pathway is a probable candidate for mediating serial adult sex change in G. histrio, and (ii) low levels of 11-KT may be important in allowing serial adult sex change in G. histrio. © 2003 The Fisheries Society of the British Isles.


Publication title

Journal of Fish Biology








Institute for Marine and Antarctic Studies


Academic Press Ltd Elsevier Science Ltd

Place of publication

London, UK

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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