Inducción a la maduración final y ovulación del yamú Brycon amazonicus con EPC y mGnRH-a

in females of yamú brycon amazonicus of first sexual maturation (two years old, body weight (bw) 1.500 ± 1 g and total length (tl) 42.6 ± 0.1 cm), two hormonal inductors were evaluated, carp pituitary extract (cpe) and mammalian gonadotropin-releasing hormone analogue (mgnrh-a). eight treatments were conducted: six with mgnrh-a (10, 15 and 20 μg/kg bw in single injection and 10, 15 and 20 μg/kg bw in two injections of 10 and 90%, respectively), one with cpe (5.5 mg/ kg bw in two applications, 10% and 90%, with an interval of 12 h), and one control (saline solution 0.9%). females induced with mgnrh-a and females controls did not spawn. the 83.3% of the females induced with cpe spawned at the 6.7 ± 0.14 h at 26.9 ± 0.18 oc (water temperature), with a mean of 117.6 ± 6.8 g per egg volume per female, and 1469.6 ± 34.1 eggs per gram. the fertility rate showed a mean of 55.3 ± 6.1% 6 hours after fertilization (haf), and 51 ± 5.8% of embryonic survival to 10 haf. the hatching happened at 12 haf. only females induced with cpe presented a significant growth of the diameter (p<0.05) of 1086 to 1178 μm.