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Neotropical Ichthyology

Print version ISSN 1679-6225On-line version ISSN 1982-0224

Abstract

ABELHA, Milza Celi Fedatto; GOULART, Erivelto; KASHIWAQUI, Elaine Antoniassi Luiz  and  SILVA, Marlene Rodrigues da. Astyanax paranae Eigenmann, 1914 (Characiformes: Characidae) in the Alagados Reservoir, Paraná, Brazil: diet composition and variation. Neotrop. ichthyol. [online]. 2006, vol.4, n.3, pp.349-356. ISSN 1982-0224.  https://doi.org/10.1590/S1679-62252006000300006.

Aspects of the feeding ecology of a small characin, Astyanax paranae, were studied during 1996/1997 and 1998/1999 in the Alagados Reservoir, Paraná, Brazil (25º01'50.0'' S; 050º03'41.9'' W). Fishes were quarterly captured from the reservoir's riverine and lacustrine zones and stomachs contents of 711 adult individuals were analyzed by volumetric method. Species' feeding spectrum and spatial, temporal and sexual variations on diet were evaluated. Data matrix was summarized by detrented correspondence analysis (DCA) and the axes scores from DCA were used as variables in one-way ANOVA of null models to test diet variations. Astyanax paranae fed on detritus/sediment, plant matter, algae and aquatic and terrestrial invertebrates. The time-space prevalence of detritus/sediment and plant matter on diet characterized the feeding habit as detritivorous tending to herbivory. Significant differences on food items proportions occurred between the sampling months and sampling sites and were related to resources availability, characterizing the species trophic opportunism.

Keywords : Fish; Feeding; Dam; Detritivory; Freshwater.

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