Brazilian Journal of Genetics
On-line version ISSN 1678-4502
REVALDAVES, Eloísa; RENESTO, Erasmo and MACHADO, Maria F.P.S.. Genetic variability of Prochilodus lineatus (Characiformes, Prochilodontidae) in the upper Paraná river. Braz. J. Genet. [online]. 1997, vol.20, n.3 ISSN 1678-4502. http://dx.doi.org/10.1590/S0100-84551997000300005.
The genetic variability of the "curimba", Prochilodus lineatus, from three locations in the Paraná river basin, was investigated by starch gel electrophoresis. A total of 160 specimens were analyzed for 19 enzymes, 12 of which permitted successful interpretation of electrophoretic patterns. Eighteen loci were identified and six of them proved to be polymorphic (EST-1*, EST-2*, IDH-1*, PGM-1*, PGM-2*, LDH-2*). Mean heterozygosity was considered high (13%) by comparison with the literature. A low level of differentiation was found among subpopulations, with mean FST = 0.018. Values of genetic distance and genetic identity suggest that, at least along this stretch of the river, P. lineatus comprises a single breed with high gene flow. This analysis has important implications for fishery management, aquaculture, and conservation of the stocks