Feminization and growth of juvenile fat snook Centropomus parallelus fed diets with different concentrations of estradiol-17β
In this study, we evaluated the effect of diets with various concentrations of estradiol-17β (E2) on the feminization, growth and survival of juvenile fat snook. Over a 45-day period, the juveniles were fed with five diets containing 0, 25, 50, 75 and 100 mg E2/kg feed. Three replicates were run for each diet. After this hormonal treatment, the fishes were transferred to 1-m3 net cages, where they remained for 12 months. During this period, they were fed a commercial diet without added hormones. During the feminization, the control fish grew more than those in the other treatments, and the survival rates did not differ significantly among the treatments. At the end of the experiment growth did not differ among the treatments. In the control treatment, 80.85 % of the fish were male, and the females were significantly larger than the males. All of the treatments with E2 produced 100 % females. No intersex fish were found in this study. This research showed that it is possible to obtain 100 % fat snook females using feeds with 25 mg E2/kg for 45 days without impairing the growth or survival of the fish.
KeywordsEstradiol-17β Growth performance Marine fish Sex ratio Protandric
We would like to thank CAPES—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior for the scholarship. This work was funded by the Brazilian research council (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq) and the Ministry of Fisheries and Aquaculture through two research projects coordinated by EPAGRI (Project No. 559790/2009-0) and UFSC (Project No. 559777/2009-4). Special thanks go to the company Nicoluzzi Rações Ltda. that provided us with the diets used in this study.
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