Monitoring of the genetic variability of pacu, Piaractus mesopotamicus, of the stock enhancement program of the Paranapanema River

J.A. Povh R.P. Ribeiro N.M. Lopera-Barrero P.C. Gomes D.V. Blanck L. Vargas C.B. Jacometo T.S. Lopes About the authors

The genetic variability of broodstocks and juveniles of Piaractus mesopotamicus raised in three hatchery stations in Parana state, that were used in the fish stock enhancement program of the Paranapanema River, was estimated. The RAPD marker was used to evaluate samples taken from broodstocks and juveniles in the hatchery stations of Palotina, Cambará, and Andirá cities. The percentage of polymorphic fragments and the Shannon genetic diversity index of broodstocks ranged from 75.0% to 71.4% and from 0.434 to 0.376, respectively. The juveniles of the hatchery stations presented higher values for both parameters, except in the hatchery station of Palotina in which the Shannon genetic diversity index was similar. The broodstocks presented high genetic variability, and this was maintained in the juveniles.

Piaractus mesopotamicus; juveniles; broodstock; RAPD; genetic variability

Universidade Federal de Minas Gerais, Escola de Veterinária Caixa Postal 567, 30123-970 Belo Horizonte MG - Brazil, Tel.: (55 31) 3409-2041, Tel.: (55 31) 3409-2042 - Belo Horizonte - MG - Brazil