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Abstract
A genetic analysis was conducted of the critically endangered migratory catfish Pseudoplatystoma corruscans from the São Francisco River basin, the basin with the second highest hydropower capacity installed in Brazil. The analysis was conducted using five microsatellite markers previously described in the literature. Genetic diversity was analyzed and compared in three wild populations and a captive broodstock for a restocking program. Catfish populations of this river showed high genetic diversity in terms of heterozygosities; however, only half of the total number of alleles found in other basins were detected. Seven private alleles occurred in this basin and most of them at low frequencies, indicating they are under threat of extinction. Overall FST and assignment test suggested low differentiation among the three wild populations; however, a marked distinction between these populations and the captive broodstock was observed. The number of alleles and low average relatedness estimates found for the captive population suggest that it could be used for restocking in areas where the wild population has collapsed, but should not be used for stock enhancement in areas where the wild population is extant. These results are important as a reference for genetic aspects that should be considered in fish management activities.
ACKNOWLEDGMENTS
This study was supported by grants-in-aid for Scientific Research from the International Foundation for Science (IFS)-(A/4311-1) and a scholarship was provided by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). We also thank José Cláudio Epaminondas of the Companhia do Vale do São Francisco e Parnaíba (CODEVASF) for his assistance in collecting tissue samples. We are grateful to anonymous reviewers who provided insightful comments on the earlier draft of this manuscript.