The role of riverine forests for food supply for the omnivorous fish Brycon opalinus Cuvier, 1819 (Characidae) in the Serra do Mar, Southeast Brazil

摘要: The purpose of this study was to characterize the diet fish Brycon opalinus (Characidae) seasonally and locally, allowing for determination its food items trophic relations with aquatic terrestrial environments. area encompasses three rivers (Paraibuna, Ipiranga Grande) in basin Paraibuna, southeast Brazil. Twelve monthly collections were made from January December 2004. degree stomachic repletion accumulated visceral fat analyzed, as intestinal length each class total length. frequency occurrence preference (DFP) determined by separating vegetal animal items, autochthonous allochthonous, insect order family consumed. origin found be equivalent that origin, thus characterizing omnivorism feeding.