Extracto hipofisiario de Coporo (Prochilodus mariae) como agente inductor sustitutivo en la reproducción de su misma especie

inoculation of exogenous gonadotropin and other substances, to reactivate the reproductive cycle of species of commercial interest, not able to spawn in captivity, warrants today the purchase of expensive imported inducing agents. therefore, it is essential to assess the biological potential of native pituitary, in the reproduction of fish species of commercial interest. the coporo for its ease of cultivation, early reproductive and phylogenetic relationship, was selected as a kind of pituitary donor. the study included the preparation and maintenance of donors in ponds, with the purpose of determining gonosomatic index; pituitary extraction, drying, storage and testing of the material. to measure the biological effects, using circular tanks of 3.000 l, with 3 females and 3 males coporo, with the application of two treatments, a control and four repetitions: the first consisted of inoculation pituitary carp (2 mg kg-1), the second of pituitary coporo (2 mg kg-1) and the physiological serum (1 ml). they were extracted and stored, a total of 107 glands of 127 used, with a loss of 15%. the results of bioassays showed that the two treatments inductors with hormonal extracts were positive in terms of reproductive efficiency, and do not differ significantly (p = 0,05). in conclusion it is feasible to replace the imported material hormone as an agent of carp inductor of reofilic species by pituitary extracts homoplásticos induced in the reproduction of the coporo