Gonadotrofina coriônica humana e hormônio liberador de gonadotrofina como indutores da reprodução do jundiá

Abstract

Hormone acquisition represents high cost, justifying the importance of studies searching for better results on inducing fish reproduction in laboratory conditions. This study analyzed the efficiency of HCG and GnRHa for gonad maturation and gamete production in jundiá, and compare the results to those using pituitary extract. Stage 1 (Males) - Four groups with eight males each received the following treatments: M1: Without hormone; M2: Pituitary extract 0.5 mg/kg; M3: HCG 200 UI/kg; M4: GnRHa+dopamine receptor antagonist 0.1 pellet/kg. Stage 2 (Females) – Thirty six females were separated in 5 groups: F1: Pituitary extract in two applications, 0.5 and 5.0 mg/kg; F2: HCG in two applications, 200 and 400 UI/kg; F3: HCG 400 UI/kg in a single dose; F4: HCG 1000 UI/kg in a single dose; F5: GnRHa+dopamine receptor antagonist 1 pellet/kg. The pituitary extract increased significantly the volume of semen and was more efficient in the final gonad maturation and ovulation, stimulating a higher number of females. The pituitary extract is efficient for the induction of jundia males and females during reproduction procedures, corroborating preview information. HCG does not induce jundiá breeders with doses employed in this study and GnRHa is not suitible to induce jundia breeders under dose recommended by the manufacturer to other tropical species.