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Genetic variability of broodstocks of restocking programs in Brazil

Genetic variability of broodstocks of restocking programs in Brazil



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Lopera-Barrero, N., Lima, E., Filho, L., Goes, E., Castro, P., Zardin, A., Poveda-Parra, A., & Ribeiro, R. (2015). Genetic variability of broodstocks of restocking programs in Brazil. Revista MVZ Córdoba, 20(3), 4677-4687. https://doi.org/10.21897/rmvz.38

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PlumX
Nelson Lopera-Barrero
Ed Lima
Luiz Filho
Elenice Goes
Pedro Castro
Aline Zardin
Angela Poveda-Parra
Ricardo Ribeiro

ABSTRACT

Objective. The aim of this study was evaluate the genetic diversity of the following broodstocks: piapara (Leporinus elongatus), dourado (Salminus brasiliensis), jundiá (Rhamdia quelen) and cachara (Pseudoplatystoma fasciatum) already useful for restocking programs in the Paranapanema, Iguaçu and Paraná Brazilian Rivers. Materials and methods. Samples from the caudal fin of 122 fish were analyzed. DNA was extracted by NaCl protocol. PCR products were separated by a horizontal agarose gel electrophoresis. The fragments were visualized by staining with ethidium bromide. Results. The amplification of 25 primers generated different fragments in studied species that allowed characterizing 440 fragments of 100-2900 bp. High percentage of polymorphic fragments (66.67 to 86.29), Shannon index (0.365 to 0.486) and genetic diversity of Nei (0.248 to 0.331) were detected. Conclusions. The level of genetic variability in the broodstocks was adequate for allowing their use in restocking programs in the studied Rivers. However, periodical monitoring studies of genetic variability in these stocks, the mating system, reproductive system and general management must be made to guarantee the preservation of wild populations.

RESUMEN

Objetivo. El objetivo de este estudio fue evaluar la diversidad genética de los siguientes lotes de reproductores: piapara (Leporinus elongatus), dourado (Salminus brasiliensis), jundiá (Rhamdia quelen) y cachara (Pseudoplatystoma fasciatum) utilizados para programas de repoblación en los ríos brasileños Paranapanema, Iguaçu y Paraná. Materiales y métodos. Muestras de aleta caudal de 122 peces fueron analizadas. El ADN fue extraído por el protocolo de NaCl. Los productos de PCR fueron separados por electroforesis horizontal en gel de agarosa. Los fragmentos fueron visualizados por marcación con bromuro de etidio. Resultados. La amplificación de los 25 iniciadores produjo diferentes fragmentos en las especies estudiadas que permitieron caracterizar 440 fragmentos de 100 a 2900 pb. Fueron detectados un alto porcentaje de fragmentos polimórficos (66.67 a 86.29), de índice de Shannon (0.365 a 0.486) y de diversidad genética de Nei (0.248 a 0.331). Conclusiones. El nivel de variabilidad genética en los lotes de reproductores fue adecuado para su utilización en programas de repoblación en los ríos estudiados. Sin embargo, estudios de monitoreo periódico de la variabilidad genética en esos lotes, del sistema de cruzamiento, del sistema reproductivo y del manejo general deben ser realizados para garantizar la preservación de las populaciones naturales.

 



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