Abstract (en):
The endemic catfish of the Magdalena River Basin Pseudoplatystoma magdaleniatum (Siluriformes: Pimelodidae) constitutes the second species in commercial importance and a target species for fishing management. To contribute to supports decision making on regulatory measures, it was evaluated their reproductive strategies in five points of influence on the basin: three in the Magdalena River, one in the Cauca River and one in the San Jorge River. Sampling was conducted since April 2012 to March 2013. Mature females (stages III and IV) were sampled (total and eviscerated weight) and gonads were removed and weighed. The ovarian samples were analyzed macroscopically and microscopically. By using the Image J and Image Tool Program it was determined the average diameter of mature oocytes in second phase 0.7 mm. The effective fecundity fluctuates between 900 000 and 1062 000 and the oocytes corresponds to a semelparous type.
Abstract (es):
El bagre rayado Pseudoplatystoma magdaleniatum (Siluriformes: Pimelodidae) es una especie endémica de la cuenca del río Magdalena y es la segunda especie en importancia comercial, razón por la cual es una especie objeto de manejo pesquero. Para contribuir a la toma de decisiones sobre medidas regulatorias de la especie, se evaluaron algunas de sus estrategias reproductivas, para lo cual se llevaron a cabo muestreos en cinco puntos de influencia tanto en el río Magdalena (cauce principal) como en sus tributarios principales: tres en el río Magdalena, uno en el rio Cauca y otro en el río San Jorge. Los muestreos se realizaron entre abril del 2012 y marzo del 2013. A las hembras sexualmente maduras (estadios III y IV), se les tomó el peso total y eviscerado y sus gónadas fueron retiradas y pesadas. Las muestras de ovarios se analizaron tanto macroscópica como microscópicamente. Con el empleo de los programas Image J e Image tool se logró determinar el diámetro promedio de los ovocitos maduros en segunda fase (0,7 mm). La fecundidad efectiva varió entre 900.000 y 1.062.000 ovocitos, siendo una especie de tipo semélpara.
Keywords:
Especie amenazada, Recurso hidrobiológico, Protección, Reproducción, Regulación pesquera (es)
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How to Cite
Arce-Zúñiga, J. W., Alonso-González, J. C., Hernández-Barrero, S., & Valderrama-Barco, M. (2014). Determination of spawning characteristics and fecundity of the the Magdalena Catfish <em>Pseudoplatystoma magdaleniatum<em> Buitrago-Suárez y Burr, 2007 (Siluriformes: Pimelodidae). Biota Colombiana, 15(Supl. 1). Retrieved from https://revistas.humboldt.org.co/index.php/biota/article/view/343
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