Ovulacion inducida e inseminacion artificial del Bagre Negro, Rhamdia sapo
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Experiments carried out to determine the possibilities and techniques of induced spawning, artificial insemination and incubation of the Bagre Negro (Rhamdia sapo), in order to allow the production of fish seed at an industrial scale, are described. Bagre Negro pituitary extract, corionic gonadotrophin and DOCA were used for induction of ovulation. Ovulation was achieved with the former two, and no response was obtained with DOCA. A maximum of 112,500 eggs per kg were produced in October. It was determined that the latent period is function of the water temperature according to the equation L. Period = 7638,24 × T°C -1,92. The eggs obtained were fertilized by the dry method and incubated in Chase jars, and in plastic mesh baskets suspended in aquaria with flowing water. Larvae showed very low mortality up to the moment of total yolk sac absortion.