Hábitos alimentares da ictiofauna do córrego Franco, Mato Grosso do Sul, Brasil

Abstract

Diet of fish fauna from Franco stream, Mato Grosso do Sul, Brazil. The aim of this study was to characterize the diet of the most abundant fish species in the Franco stream (Ivinhema, MS). Fish were captured monthly, from March 2006 to February 2007. To infer the diet of species that feed on macroscopic items, the stomach contents of each individual was removed, weighed (g) and subsequently analyzed under stereomicroscope. The data obtained for each species in each sampling unit were analyzed with the following methods: Frequency of Occurrence, Volumetric Analysis Index and Index of Importance. We collected 17 species of fish, the vast majority Characiformes, with ten species, two species of Siluriformes, two of Perciformes, two of Gymnotiformes and one of Synbranchiformes. The diet of two species of the genus Astyanax was based mainly on items of plant origin; Serrapinnus notomelas fed up of plant items, mainly from algae; Hemigrammus marginatus showed a mainly insectivorous feeding habits of alien origin, Corydoras aeneus and Eigenmannia trilineata fed up primarily of aquatic insects; sediment was the main food item of Hypostomus ancistroides, followed by algae and macrophytes; Crenicichla britiskii fed mainly on terrestrial insects.

Feeding ecology of Serrapinnus notomelas (Characiformes: Cheirodontinae) in small forest streams in the Machado River basin, Rondônia, Brazil

“…According to Brandão-Gonçalves et al (2010), who studied a stream in river Paraná basin, the most abundant and most important items in the diet of S. notomelas were algae and macrophytes. Items of animal origin were not frequent.…”

“…Although different feeding classifications have been used for Cheirodontinae species, the information available in the literature suggests that most of these species have omnivorous habits and that they may consume predominantly, or have a tendency to consume, one particular item (Brandão- Gonçalves et al 2010). Generally, the food items ingested by Cheirodontines are very similar and the food spectrum is relatively limited.…”

Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

“…Nevertheless, some results reported herein differ from those in the literature; for instance, H. eques was classified as aquatic invertivorous but considered by other researchers as zooplanktivorous in macrophyte stands of the same floodplain studied (Pelicice & Agostinho, 2006;Crippa et al, 2009). Serrapinnus notomelas, algivorous, was considered herbivorous, consuming algae and bryophytes (Pelicice & Agostinho, 2006) and omnivorous tending to herbivory (Brandão-Gonçalves et al, 2010). These differences in the diet can be attributed to the plasticity observed in freshwater fish, whereas environmental characteristics and ontogeny may influence the use of food resources (Abelha et al, 2001).…”

Trophic ecology of Hemigrammus marginatus Ellis, 1911 (Characiformes, Characidae) in a conserved tropical stream

“…In a study in the same reservoir, Pelicice and Agostinho (2006) found that the H. marginatus species fed mainly on autochthonous items, zooplankton was a significant part of the diet and larvae of aquatic insects and terrestrial insects were consumed in smaller quantities. The diet of H. marginatus in a stream in the municipality of Ivinhema, Mato Grosso do Sul consisted of insects as the main item (Brandão-Gonçalves et al, 2010). Studying a flood area in the Paraná River, Santana-Porto and Andrian (2009) found that the diet of the H. marginatus species consisted of zooplankton, especially cladocerans.…”