Reprodução induzida com o extrato de hipófise de tilápia-do-nilo, em piabanha (Colossoma macropomum) e curimatã (Prochilodus argenteus)

Abstract

The objective was to study the use of the pituitary of male tilapia, the Nile in the hormonal induction in curimatã (Prochilodus argenteus), and piabanha (Colossoma macropomum). For extraction of the pituitary were selected 24 specimens of male tilapia, Nile. For hypophysation were used curimatã weighing on average 500 ± 140 g and 14 male, weighing on average 790 ± 240 g and 16 matrices piabanha (280 ± 40 g), which received pituitary extract of tilapia, Nile, and two applications being first of 0.5 mg / kg, (priming dose) and, after interval 12 hours, the second dose of 5.0 mg / kg (dose decisive). Males received a single dosage of hypophysis extract commercial 2.5 mg / kg liveweight, at the time of 2nd dose in females. The process of hormonal induction was performed 24 hours after capture and selection. It was observed that all females who receivedhypophysis extract tilapia did not allow the extrusion of gametes, however all females who received the commercial extract allowed the extrusion, producing on average 81.92 ± 40.19 g of oocytes. All the male gametes produced also after ventral massage. In the conditions of this experiment was conducted, both as curimatã piabanha. treated with the crude pituitary tiápia-the-Nile, did not promote the extrusion of the oocytes.