Hormonal induction of the reproduction in jaú (Zungaro jahu): case report

Abstract

This case report divulges the results of two studies conducted to evaluate the reproduction induction in males and females of jaú (Zungaro jahu) submitted to different concentrations and number of doses of crude extract of carp pituitary (CECP). The study I was conducted during the reproductive period between the years of 2006 and 2007, whereas the study II was carried out between 2007 and 2008. In the study I, the males (number of individuals, N = 3) were submitted to two doses of CECP (0.50 and 5.00 mg/kg of body weight ‒ BW) while the females (N = 3) received three doses (0.25, 0.50 and 5.00 mg/kg of BW). In the study II, the male (N = 1) was submitted to four doses of CECP (0.30, 0.30, 0,30 and 6.00 mg/kg of BW) while the female (N = 1) received three doses (0.30, 0.60 and 6.00 mg/kg of BW). In both studies were evaluated the parameters: weight of the spawning, number of eggs per gram of spawning, individual and relative fecundity, gonadosomatic index for the females; and spermiation volume and sperm concentration for the males. The fertilization rate also was determined. For all evaluated parameters, the doses of CEPC used in the study II resulted in the better hormonal induction of the reproduction in Zungaro jahu.