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Genetic variability of the striped catfish Pseudoplatystoma fasciatum Pisces Pimelodidae from the Magdalena river, Colombia Variabilidad genetica del bagre rayado Pseudoplatystoma fasciatum Pisces Pimelodidae en el rio Magdalena Colombia



Genetic variability of the striped catfish Pseudoplatystoma fasciatum Pisces Pimelodidae from the Magdalena river, Colombia Variabilidad genetica del bagre rayado Pseudoplatystoma fasciatum Pisces Pimelodidae en el rio Magdalena Colombia



Revista de la Academia Colombiana de Ciencias Exactas Fisicas y Naturales. Diciembre; 27105: 599-605



Genetic variation of Pseudoplatystoma fasciatum (bagre rayado) was explored through allozyme analysis at 15 polymorphic protein coding loci in samples from three localities in the Magdalena river basin. Both the Standard genetic distance (0.00041< D >0.00006) and the Fixation index (FST= 0.006) values suggest that individuals belong to the same gene pool. Mean heterozygosity values were extremely low and no polimorphism was detected in any system. Results support the idea of a single panmictic population favored by the reproductive isolation produced by geological events during the formation history of the basin, the absence of geographic barriers and the migratory behavior of the species. However, a question rises on the impact that is being imposed by the sustained overfishing process and the evident deterioration of the basin. The two markers identified may result useful to monitor the health of the population.

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