Abstract

BERTRAN, P. et al. Trophic habits of Acestrorhynchus pantaneiro (Menezes 1992) in the alluvial valley of the Paraná River, Corrientes (Argentina). Rev. vet. [online]. 2024, vol.35, n.1, pp.62-68. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.3517482.

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The study of fish diets allows us to understand how they influence other organisms in the ecosystem through trophic interactions. The aim of this study was to expand our knowledge of the trophic habits of Acestrorhynchus pantaneiro in the alluvial valley of the Paraná River, Corrientes (Argentina). This study involved the collection and evaluation of 140 individuals of A. pantaneiro between May 2016 and February 2018 in four areas of the Paraná River, downstream of the Yacyretá dam. The stomach contents were analyzed at the taxonomic level to calculate the following indicators: frequency of occurrence index, volumetric method, and dietary index. Of the 140 specimens evaluated, 58% had some type of food item in their stomach, whereas 42% were found empty. The analysis of stomach contents allowed us to differentiate several species consumed belonging to the orders Perciformes, Characiformes and Siluriformes; however, the genus Crenicichla presented the highest percentage values of the indicators. The results of this study suggest that A. pantaneiro, in addition to having piscivorous trophic habits, demonstrated preferences for consuming species of the genus Crenicichla.

Keywords : diet; piscivore; Acestrorhynchus pantaneiro; Yacyretá; alluvial valley.

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