Análise investigatória do método de reversão sexual da tilápia do nilo (Oreochromis niloticus), linhagem Chitralada, na piscicultura Mar Doce do Nordeste

Abstract

This work was developed inside the facilities of Mar Doce do Nordeste Piscicultura e Projetos Ltda., attempting to confirm if the sexual reversion process of the Nile Tilapia (Oreochromis niloticus) fingerlings was inside what was foreseen in Pompa & Green’s reversion technique, using the masculinizing hormone 17 α-methyltestosterone, obtaining then, as detailed by the technique, monosex specimens with reversion rate above 95%. The fishes were fed with feed containing 60 mg/kg of 17 α-methyltestosterone, which was given 6 times per day, during the period of 28 days in a masonry vivarium in the first 10 days, followed by 18 days in another vivarium dug in the ground. After 120 days of cultivation, the specimen were slaughtered and eviscerated to posterior visual analysis of the gonads. The obtained results revealed reversion rates lower than what were expected with the correct application of Popma & Green’s reversion technique, appointing the protocol’s necessity of revision, in order to reach monosex specimen and improve the quality of the commercialized tilapia’s fingerlings.