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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 F(1) 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.

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