![]() ![]() The histological examination showed that the treatment caused an increase in male gonad recrudescence in most of the treated fish. The maximum sex ratios of males (95% and 97%) were recorded at 60 mg of 17α-MT/kg of diet after 75 days and one year of treatment respectively.Īfter the first year, the degree of sex stability was observed significantly shifted towards males. The results showed that the highest survival rates of the fry were recorded in the group treated with 60 mg of 17α-MT/kg of feed compared to the control group, 40 and 80 mg of 17α-MT/kg of feed treated groups. ![]() With the purpose of solving some practical problems concerning the complete masculinization of Oreochromis niloticus by oral administration of 17α-methyltestosterone (17α-MT) with respect to the dose of the hormone used, different doses of 17α-MT (40, 60 and 80 mg of 17α-MT/kg of feed) were orally administered to sexually undifferentiated fries from the 7th to the 28th day posthatching to produce all male tilapia population.Īfter 15, 35 and 75 days and 1 year of treatment, growth parameters, survival rate, sex ratio and gonad histology of the resulting larvae and fish were demonstrated. ![]()
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