Biología alimentaria y reproductiva de Hyphessobrycon poecilioides (Pisces: Characidae) en la cuenca del río La Vieja, Alto Cauca, Colombia

• Autores: Carlos A. García Alzate, César Román Valencia
• Localización: Revista del Museo Argentino de Ciencias Naturales, ISSN-e 1853-0400, ISSN 1514-5158, Vol. 10, Nº. 1, 2008, págs. 17-27
• Idioma: español
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• Resumen

  • Feeding and reproductive biology of Hyphessobrycon poecilioides (Pisces: Characidae) fromLa Vieja River basin, Alto Cauca, Colombia. The ecology of a characid fish (Hyphessobrycon poecilioides)from upper Cauca River (Colombia) was studied. The secondary drainages display width and depth 2.4 m and 0.5m respectively. The pH is around 7.0 (mean 7.35), the surface temperature 21.4° C, air temperature 24.2° C, oxygenlow (mean 3.2 ppm). The diet consisted primarily of algae (24.46%) and insects (21.24%). A variation of the dietwas observed, showing a tendency to eat algae (24.46%) in the wet season and insects (21.24%) in the dry one. Thereproduction of the species takes place at the end of the wet season (april). The sex ratio is 1:1. Fecundity is high(2048 oocytes) and the mean small oocytes (0.052 mm). The size of sexual maturity is 52 mm SL for males and 55mm SL for females. They showed reproductive strategy “r” and wide spectrum in the diet. A low and positivecorrelation was observed between standard length and intestinal length (r = 0.56), and a significant positivecorrelation between total weight and stomach weight (r = 0.9). Physical and chemical data are also included.