Population structure, condition and diet of Oligosarcus paranensis (Menezes & Gery, 1983) (Osteichthyes: Characidae) at two reservoirs in South Brazil

Authors

  • Milza Celi Fedatto Abelha Universidade Estadual de Mato Grosso do Sul, Grupo de Estudos em Ciências Ambientais e Educação
  • Elaine Antoniassi Luiz Kashiwaqui Universidade Estadual de Mato Grosso do Sul, Grupo de Estudos em Ciências Ambientais e Educação
  • Erivelto Goulart Universidade Estadual de Maringá, Núcleo de Pesquisas em Limnologia e Aquicultura, Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais

Keywords:

fish, sex ratio, feeding, dog-tooth characid, impoundments

Abstract

This study investigated the population parameters, condition and diet of Oligosarcus paranensis at Fiú and Mourão Reservoirs, located in Paraná State, Brazil. The fishes were collected quarterly between 1996/1997 and 1998/1999 using gillnets. Food items were quantified by volumetric method. The specimens at Fiú showed comparatively smaller length and worse condition. Sex ratio was statistically equal to 1:1 at Mourão, whereas there was a significant predominance of males at Fiú. Sex ratio also varied among size classes. Allometric growth prevailed among the studied groups. The diet consisted mainly of fishes and was complemented with invertebrates and plant matter in both reservoirs. There was a change in the feeding pattern as the standard length increased. Fishes changed from invertivores to piscivores, except for males in Mourão, for which a reverse trend occurred.

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Published

2012-03-01

How to Cite

Abelha, M. C. F., Kashiwaqui, E. A. L., & Goulart, E. (2012). Population structure, condition and diet of Oligosarcus paranensis (Menezes & Gery, 1983) (Osteichthyes: Characidae) at two reservoirs in South Brazil. Biota Neotropica, 12(1). Retrieved from //www.biotaneotropica.org.br/BN/article/view/916

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