Effect of estradiol-17B on the sex ratio, growth and survival of juvenile common snook (Centropomus undecimalis)
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Universidade Estadual de Maringá
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Sex control in fish is a promising technique for aquaculture, since it gives advantages associated with one sex. The aim of this study wa s to investigate the feminization of common snook ( Centropomus undecimalis ) by oral administration of two doses of estradiol-17 β (50 and 100 mg E 2 kg -1 feed) and control treatment for 45 days and to evaluate thei r effects on the sex ratio, growth and survival of common snook juveniles. After this period, fish were fed only with commercial feed without hormone supplementation. During the period of E 2 administration, the control fish grew more than those in the other treatments. At the end of the experiment in the treatment with 50 mg E 2 kg -1 , 26.32% of the fish were male, 68.42% were female, and 5.26% were intersex. In the treatment with 100 mg E 2 kg -1 , 10% of the fish were male, and 90% were female. There was no difference in grow th among the treatments after 11 months. This study showed that it is possible to obtain 90% common snook females using feeds with 100 mg E 2 kg -1 for 45 days without impairing th e fish growth or survival.
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