Resumo

PARDO-CARRASCO, Sandra C et al. Induction to maturation and ovulation of yamú Brycon amazonicus with CPE and mGnRHa. Rev Colom Cienc Pecua [online]. 2006, vol.19, n.2, pp.160-166. ISSN 0120-0690.

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.

Palavras-chave : Bryconinae; culture; reproduction.

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