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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Abstract

YABE, Regina de Souza  and  BENNEMANN, Sirlei Terezinha. Diet composition of Schizodon intermedius Garavello & Britski of the Tibagi river, Paraná and its relation to some morphological characteristics of the digestive tract (Osteichthyes, Anostomidae). Rev. Bras. Zool. [online]. 1994, vol.11, n.4, pp. 777-788. ISSN 0101-8175.  http://dx.doi.org/10.1590/S0101-81751994000400019.

In order to analyse the diet of Schizodon intermedius Garavello & Britski, 1990, captures were made every season during the period of April/1990 to February/1991, using gillnets of different mesh size at Sertanópolis, a region of Paraná State. An analysis of stomach fullness degree was made upon 76 individuals (including young ones). A sample of 20 adult specimens was chose to compare the morphology of the digestive tract with the diet found. It was concluded that S. intermedius is a grazer herbivore whose principal diet consists of leaves and stalks of two monocotyledonous plants: Poaceae and/or Cyperaceae. This species shows quanlitative, but not qualitative feeding seasonal variations. It was verified that intestinal quotient of the species is X = 1.34, the variation of gill rakers number is 18-23 and of the pyloric caeca number is 15-25. These morphological characteristics found in this species are typical of herbivore fishes.

Keywords : Pisces; Anostomidae; Schizodon intermedius; food; herbivore.

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