Efeitos do hormônio 17 -metiltestosterona na masculinização do peixe Betta splendens Regan, 1909

Abstract

Biotechnology has been spread by all branches of aquaculture, especially in the reverse sexual and masculinization of fish. The male of the species Betta splendens presents vibrant color in your body and fins larger than the females, these characteristics, sought by breeders ornamental. Studies aimed at masculinization, as well as techniques and protocols for the reversal of sexual beta through hormonal induction are of great applicability in ornamental aquaculture. The reversal occurred for a single bath of immersion with 500 μ g / L of the hormone 17 - metiltestosterona (MT) during 24 hours in fish with 2, 4, 10, 30 to life, even in their eggs. Despite the sexual phenotypic proportion of 100% of males, the more young fish subjected to the treatment, the greater his mortality. Besides the growth of all fish processed have been significantly lower than the control. Masculinization were used in concentrations of 10, 30 and 60 mg / kg of ration MT in adult females in the beta. At the end of 90 days, all females treated showed growth of the body and fins significantly larger than those of control, in addition to submitting male phenotypic characteristics, including about the reproductive behavior. The present study showed that instead of reverting sexual, the masculinization of adult females of beta can be used by producers seeking to increase their profits.