title: Two genetic stocks of Steindachneridion melanodermatum living in sympatry in nature and genetic variability of wild parents and F₁ generation.
abstract: 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.
authors: Laboratório de Ecofisiologia e Evolução Molecular, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brasil. daniele.matoso@inpa.gov.br
authors: D A
authors: DA
authors: Matoso
authors: M
authors: M
authors: da Silva
authors: M C S
authors: MC
authors: Cortinhas
authors: M M
authors: MM
authors: Cestari
authors: M C
authors: MC
authors: de Almeida
authors: M R
authors: MR
authors: Vicari
authors: R F
authors: RF
authors: Artoni
mesh_terms: D000818:Animals; D001938:Brazil; D002397:Catfishes / Q000235:genetics*; D056426:Genetic Loci; D005819:Genetic Markers; D014644:Genetic Variation; D019105:Random Amplified Polymorphic DNA Technique
chemical_list: D005819:Genetic Markers