Resumen del producto

Production of hybrid fish is in other way, a form to improve growth rate, sex manipulation ratio and increased environmental and disease tolerances. A hybrid fish is practically a new species, so it is necessary to have a new description in some standards. One of these descriptions is about the reproductive system in which is necessary to know the process gonad development. A cross between serranid fish Paralabrax humeralis X P. maculatofasciatus was obtained and the progeny were reared in a closed system. During 15 months, the development of the gonads was followed, which started at 15 days after hatch (DAH) until 450 DAH. Gonads were removed from sacrificed fish, weighed, and preserved in 10% buffered formalin. Cuts of 3-5 µ were made and stained with hematoxylin-eosin for histological examination. After 13 months, males were not found, which could be an evidence of protogynous condition, and could be a tool to produce monosex populations, but further investigation is needed for this matter. The reproductive patterns are important because they show a strategy to follow to enhance fish culture of this species. In this case, the fact that there was an absence of males is important in the start periods; because it reduces energy expenditure in reproduction and could be a way to improve growth.

Palabras clave: Aquaculture; gonadal development; Paralabrax; Hybrids

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