Abstract
ABSTRACT The Neotropical catfish genus Pseudoplatystoma comprises eight species of large size, widely distributed in South American basins. The endangered species P. magdaleniatum is endemic to Magdalena basin (Colombia), experiences high fishing pressure and its population genetics is relatively unknown. To study the genetic status and structure of P. magdaleniatum, 25 species-specific polymorphic microsatellite loci were developed using next-generation sequencing and then tested in samples collected in the Magdalena-Cauca basin. Based on 15 of these loci, P. magdaleniatum showed a high number of alleles per locus (9-10), high values of observed (0.762-0.798) and expected (0.770-0.791) heterozygosities, recent reduction of population size and gene flow. These findings constitute a baseline to measure potential changes in genetic diversity and structure of this commercially important species in a basin undergoing high anthropogenic activities.
Highlights
The family Pimelodidae comprises 114 species of freshwater fishes widely distributed throughout the Neotropics, including some of the largest and most commercially valuable migratory catfish species (Fricke et al, 2020; Malabarba, Malabarba, 2020)
The current fishing regulations are solely based on information about the sexual maturity size and reproductive periods (Mojica et al, 2012; Álvarez-León, 2016) and little is known about the population genetics of this species, this information is crucial for the development of effective management and preservation policies
Twenty-five microsatellites loci with tetra- (21) and pentanucleotide (4) motifs were developed for P. magdaleniatum (Tab. 1) and no amplification errors were detected by Micro-Checker v2.2.3
Summary
The family Pimelodidae (long-whiskered catfishes) comprises 114 species of freshwater fishes widely distributed throughout the Neotropics, including some of the largest and most commercially valuable migratory catfish species (Fricke et al, 2020; Malabarba, Malabarba, 2020). The genus Pseudoplatystoma Bleeker, 1862 contains species that inhabits several of the main river basins of South America, can reach more than 1.3 m in length and have a strong commercial interest in fishery due to the high market demand of its meat (Buitrago-Suárez, 2006; Buitrago-Suárez, Burr, 2007; Reis et al, 2016). Pseudoplatystoma magdaleniatum Buitrago-Suárez & Burr, 2007 (formerly Pseudoplatystoma fasciatum (Linnaeus, 1766)) is an endemic species, the largest migratory fish from Magdalena River basin (Zapata, Usma, 2013) and the most important fishery resource in Colombia behind Prochilodus magdalenae Steindachner, 1879 (bocachico) (Lasso et al, 2011; Zapata, Usma, 2013; Mojica et al, 2016). In Pseudoplatystoma, microsatellite loci have been developed for P. corruscans ni.bio.br | scielo.br/ni
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