Two genetic stocks of Steindachneridion melanodermatum living in sympatry in nature and genetic variability of wild parents and F1 generation

D.A. Matoso1, M. da Silva2, M.C.S. Cortinhas3, M.M. Cestari3, M.C. de Almeida2, M.R. Vicari2, and R.F. Artoni2

1Laboratório de Ecofisiologia e Evolução Molecular, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brasil
2Programa de Pós-Graduação em Biologia Evolutiva, Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Campus de Uvaranas, Ponta Grossa, PR, Brasil
3Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná, Centro Politécnico, Curitiba, PR, Brasil

Corresponding author: D.A. Matoso
Genet. Mol. Res. 10 (4): 2606-2612 (2011)
Published October 25, 2011


Steindachneridion melanodermatum is a large Brazilian catfish, highly prized for sport fishing and for its meat. Specimens of this species, both caught in nature from Iguacu River and F1 fish born in captivity, were analyzed with regard to patterns of RAPD molecular markers. Genetic similarity ranged from 0.57 to 0.95; two groups were determined for the wild specimens. The results suggest different genetic lineages in sympatry in nature. Heterozygosity and percentage of polymorphic loci were 0.31 and 79% and 0.23 and 62%, respectively, for the two populations of wild specimens and 0.26 and 66%, respectively, for those born in captivity.

Key words: RAPD; Genetic conservation; Fish; Surubim.

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