Trophic ecology of Liso (Rhamdia quelen Quoy & Gaimard, 1824) in the Sinu river, Colombia

Objective. To study the trophic ecology of Liso in the Sinu river as a contribution to the knowledge of its biology and ecology, preservation in wild environment and the management of fishery in the basin. Materials and methods. The stomach content was analyzed by using the Proportion of empty stomachs, digestion rate, Frequency of occurrence, numerical Frequency, Gravimetry, relative importance Index (RII) and gut length (GL)-total length (TL) relationship. Results. 38.2% of stomachs were empty, 92.5% of preys were half digested and five food items were identified, they are conformed by Fish, Crustaceans, Insects, Vegetable Rests and Others. Fish, conformed by Cachama, Cocobolo, Mayupa, Sardine and Rest of other fish, was the most common prey (69.9%), the most abundant prey (45.5%) and the greatest prey composition in weight (76.8%). Relative importance Index indicated that fish was the main prey (RII =81.6%), and the other prey reached low relative importance, or circumstantial or incidental prey. Conclusions. The results reached in this study indicate that the Liso is a fish with nocturnal and carnivorous feeding habits, with a tendency to consume other fish.