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摘要
Rhamdia quelen e Pseudopimelodus charus s o dois bagres que atingem porte acima de 2 kg. Esp谷cimes receberam dose 迆nica de extrato bruto de hip車fise de carpa comum EBHC (2,5 mg kg-1 de peixe nos machos e 6 mg kg-1 de peixe nas f那meas). A extrus o de ov車citos ocorreu cerca de 12,2 e 12,3 horas ap車s a aplica o de EBHC, respectivamente para R. quelen e P. charus (temperatura da 芍gua a 26oC). Mais de 75% das f那meas das duas esp谷cies responderam positivamente ao tratamento com taxas m谷dias de fertiliza o dos ov車citos acima de 75%. Ov車citos de P. charus e R. quelen s o esf谷ricos, opacos, demersais, livres erecobertos por capa gelatinosa, contendo em m谷dia 1073 e 1128 ov車citos por grama, respectivamente. Larvas das duas esp谷cies eclodiram cerca de 21 horas ap車s a fertiliza o dos ov車citos, com temperatura da 芍gua a 24oC. Rhamdia quelen and Pseudopimelodus charus are two catfish species that can reach more than 2 kg. The specimens received one dose of crude carp pituitary extract (CCPE) (2.5 mg kg-1 for males and 6 mgkg-1 for females). Oocyte extrusion was done after 12.2 and 12.3 hours after the CCPE injection in R. quelen and P. charus respectively, at water temperature of 26oC. More than 75% of the females of both species presented a positive response to the treatment, with mean rates of oocytes fertilization above 75%. The oocytes of P. charus and R. quelen are spherical, opaque, demersal, non adherent and covered by a jelly coat. There were found a mean number of 1073 and 1128 oocytes per gram respectively and the larvae of the two species ecloded around 21h after oocyte fertilization at 24oC.
