EFFECTS OF MALES AND FEMALES RATIO IN REPRODUCTIVE PARAMETERS AND VERIFYING THE BEST DOSE OF THE HORMONE 17--METHYLTESTOSTERONE IN SEXUAL REVERTION OF NILE TILAPIA (<I>OREOCHROMIS NILOTICUS</i>) THAILAND LINE
Abstract
The experiment was conducted in the Furnas hydrobiology and picisculture station situated in São José da Barra - Minas Gerais in Brasil with a view to verifying the best ratio between males and females and also ideal dose of 17--methyltestosterone, adjusting a management methodology in the reproduction of Nile tilapia fish. Two experiments were conducted, the first one verifying the best ratio between males and females (1:1; 1:1.4; 1:2; 1:3; 1:5) and the parameters evaluated were: eggs production; spawning number and hatching percentage. In the second experiment was observed the ideal dose of the hormone 17-methyltestosterone, its being made up of five hormone level: treatment A with 0 mg of hormone/kg of ration, treatment B with 30 mg de hormone/kg of ration, treatment C with 60 mg of hormone/kg of ration, treatment D with 90 mg of hormone/kg of ration and treatment E with 120 mg of hormone/kg of ration and the parameters evaluated were: percentage of male without a hormonal treatment and percentage of males after hormonal treatment. In the first experiment, the ratio of one male to one female produced the highest number of eggs (P<0.05). In the second experiment there were significant differences (P<0.01) for dosage of 17--metiltestosterona equal or superior to 37.5 mg of hormone/kg of ration, which produced 100% of males.Downloads
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