Induced sex change in black sea bass


Experiments were conducted to identify factors involved in sex change in the protogynous black sea bass Centropristis striata. Black sea bass maintained in the ratio of 8 females (F):0 males (M) for 9 months reversed sex while those kept at the ratios of 6F:2M or 4F:4M did not. Female black sea bass implanted with 1.0 mg 11-ketotestosterone (11-KT) or 10 mg fadrozole (FAD) changed sex and began spermiating while those implanted with 0.1 mg 11-KT or 1.0 mg FAD underwent incomplete sex reversal. One fish implanted with 1.0 mg FAD initiated sex change but was not spermiating at the end of the study. One fish in the control group, the largest fish in the study, initiated sex change. These results suggest that the presence of males may restrict sex reversal in black sea bass and that high 17 beta-oestradiol:11-KT is required for maintaining ovarian function. (c) 2006 The Authors Journal compilation (c) 2006 The Fisheries Society of the British Isles.

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Journal of fish biology


John Wiley and Sons

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© 2006 The Authors Journal compilation ©2006 The Fisheries Society of the British Isles