Dieta y reproducción de Lasiancistrus caucanus (Pisces: Loricariidae) en la cuenca del río La Vieja, Alto Cauca, Colombia

• Autores: César Román Valencia, Héctor Zamudio
• Localización: Revista del Museo Argentino de Ciencias Naturales, ISSN-e 1853-0400, ISSN 1514-5158, Vol. 9, Nº. 2, 2007, págs. 95-101
• Idioma: español
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• Resumen

  • Diet and reproduction in Lasiancistrus caucanus (Pisces: Loricariidae) from La Viejariver basin, Alto Cauca, Colombia. Diet and reproduction habits in Lasiancistrus caucanus from La Viejariver, Alto Cauca, Colombia, were studied. The sampling was carried out from September 2003 to August 2004in four secondary drainages, with a width between 3 - 15 meters and mean depth of 1 meter. Its habitat isprincipally conformed by kikuyo grass (Poacea) and matandrea (Hedichium coronarium). The dissolved oxygenand the saturation is high (7.8 mg/l and 91% respectively), pH 7.3. The superficial water temperature reaches21°C and the air temperature 24.9°C. L. caucanus is a nocturnal species, found adhering to the substrate (rocksand logs) along the edges of the stream; during the day it is usually captured among a plant called matandrea inSpanish (Edichium coronarium) but at night it is found in the grass (Poacea). The diet is conformed by algaethat adheres to the substrate, although two insect larvae were found in a stomach. There are differences betweenthe diets from the different drainages and among fish of different sizes. The spawning was observed betweenJune-August and October-December. Fecundity was low (185 oocytes) with an average mean egg diameter of 1.5mm. The sex ratio is 2.6:1, with dominance of females.