do Prado, Fernanda Dotti [UNESP]Hashimoto, Diogo Teruo [UNESP]Senhorini, Jose AugustoForesti, Fausto [UNESP]Porto-Foresti, Fábio [UNESP]2014-05-202014-05-202012-08-01Fisheries Research. Amsterdam: Elsevier B.V., v. 125, p. 300-305, 2012.0165-7836http://hdl.handle.net/11449/18496Molecular markers (Multiplex-PCR and PCR-RFLP of nuclear and mitochondrial genes) were used to assess the frequency of hybrids in wild stocks of two catfish species: Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum. Analysis of fish from the Paraguay-Parana hydrographic basin (Brazil) revealed a low frequency of hybrids in the Parana River (3.60%), which might be the result of natural hybridisation. However, the frequency of hybrids was higher in the Mogi Guacu (50.00%) and Aquidauana (30.75%) Rivers, whose aquaculture systems support the majority of Brazil's fish farms, suggesting that the existence of hybrids in wild populations may be due to introduction or escapes from farm stocks. Furthermore, the identification of a post-F1 individual in the Mogi-Guacu River provides evidence of genetic introgression. These results show that safeguards are needed to ensure the correct handling of hybrids and the protection of native species. (C) 2012 Elsevier B.V. All rights reserved.300-305engPseudoplatystomaInterspecific hybridIntrogressionMolecular markersGenetic conservationArtigo10.1016/j.fishres.2012.02.030WOS:000304849100032Acesso restrito3815338174165832