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Temporal variations in the feeding of the endangered Neotropical fish Brycon orthotaenia (Characiformes: Bryconidae) in the middle São Francisco River

ABSTRACT We analyzed the diet and seasonal variation in diet composition of Brycon orthotaenia, an endangered and endemic species of the São Francisco River Basin, in the middle stretch of the São Francisco River. Brycon orthotaenia had an herbivorous diet, with occasional consumption of animals, mainly in the dry season. Variation among dry and wet seasons in diet composition may be related to the species’ reproduction and energy allocation, since some items (e.g. insects, fishes) may support gonadal development.