Abstract

FERRIZ, Ricardo A; FERNANDEZ, Eduardo M; LOPEZ, Guillermo R  and  BENTOS, Cristina A. Feeding of Pseudocorynopoma doriai (Pisces: Characidae) in "El Portugués" stream, Buenos Aires province, Argentina. Rev. Mus. Argent. Cienc. Nat. [online]. 2012, vol.14, n.2, pp.243-251. ISSN 1853-0400.

: We describe the diet of dragonfin tetra, Pseudoeorynopoma doriai, in the El Portugués stream (58° 26' 30" S - 35° 04' 24" W) belonging to the high Samborombón river basin, Buenos Aires province. To achieve this aim, samples were taken monthly from May 2004 until April 2005. The methods used for the analysis of stomach contents were, frequency, volumetric percentage, numerical percentage and index of relative importance (IRI). The results obtained indicate a diet with no significant differences throughout the year, consisting mainly of aquatic insects, allochthonous insects and spiders. The analysis shows that while there were no significant differences in diet at differents range length of this species, individuals less than 42 mm standard length, consumed a greater number of insects of terrestrial origin. The results allow to characterize Pseudoeorynopoma doriai as a generalist insectivorous species for this stream of Pampasia.

Keywords : Fish; Pseudoeorynopoma doriai; food; Argentina.