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Atividade alimentar de espécies de peixe do rio Tibagi, relacionada com o desenvolvimento de gordura e das gônadas

Feeding activity and its relations with fat and gonadal development of fish species from Tibagi river

Resumo

The fish assemblage in a stretch of Tibagi river was studied during the period of one year, throught monthly sampling. It was observed that four fish species (Schizodon intermedius Garavello & Britski, 1990, Acestrorhynchus lacustris Reinhardt, 1874, Pimelodus maculatus Lacépède, 1803 and Steindachnerina insculpta Fernandez-Yepez, 1948) were very frequent and they represent all the main trophic groups. In order to characterize feeding activity, fat storage and reproduction the means degree of repletion, fat and maturation, obtained for each species in each month were compared among the four fish species. Steindachnerina insculpta, a detritivovous species was the one with the highest feeding activity while A. lacustris, a piscivorous fish, showed the lowest feeding activity. For these two species it was clearly observed a sequence of events: higher feeding activity followed by higher fat storage followed by reproduction, that was not observed for P. maculatus and S. intermedius. The variations in feeding activity and fat storage showed by P. maculatus and S. intermedius might be related to their diets.

Fish; feeding activity; gonadal development; Tibagi river; Paraná


Fish; feeding activity; gonadal development; Tibagi river; Paraná

Atividade alimentar de espécies de peixe do rio Tibagi, relacionada com o desenvolvimento de gordura e das gônadas

Feeding activity and its relations with fat and gonadal development of fish species from Tibagi river

Sirlei Terezinha Bennemann; Mário Luís Orsi; Oscar Akio Shibatta

Departamento de Biologia Animal e Vegetal, Centro de Ciências Biológicas, Universidade Estadual de Londrina. 86051-970 Londrina, Paraná, Brasil

ABSTRACT

The fish assemblage in a stretch of Tibagi river was studied during the period of one year, throught monthly sampling. It was observed that four fish species (Schizodon intermedius Garavello & Britski, 1990, Acestrorhynchus lacustris Reinhardt, 1874, Pimelodus maculatus Lacépède, 1803 and Steindachnerina insculpta Fernandez-Yepez, 1948) were very frequent and they represent all the main trophic groups. In order to characterize feeding activity, fat storage and reproduction the means degree of repletion, fat and maturation, obtained for each species in each month were compared among the four fish species. Steindachnerina insculpta, a detritivovous species was the one with the highest feeding activity while A. lacustris, a piscivorous fish, showed the lowest feeding activity. For these two species it was clearly observed a sequence of events: higher feeding activity followed by higher fat storage followed by reproduction, that was not observed for P. maculatus and S. intermedius. The variations in feeding activity and fat storage showed by P. maculatus and S. intermedius might be related to their diets.

Key words: Fish, feeding activity, gonadal development, Tibagi river, Paraná

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AGRADECIMENTOS. Este estudo teve suporte financeiro pelo convênio UEL/COPATI/KLABIN e auxílios suplementares do CNPq e da CAPES. Agradecemos ao Sr. Manoel Reis que gentilmente permitiu a utilização de sua propriedade rural próxima ao rio. À Ângela Teresa Silva-Souza e Lúcia Giuliano-Caetano, que coordenaram o grupo de estudos ictiológicos nesta fase de pesquisa. Agradecemos muito às pessoas que nos ajudaram nas coletas, particularmente Mauro Caetano Filho, Ricardo Siqueira, Edson Santana e Jacson Franco Bennemann, que trabalharam no barco independente da hora, frio, vento e sol. À Angela Maria Veregue, Alda Maria Borgui e Ana Karina Varoni pela coleta de dados das gônadas dos peixes estudados. À Claudia Bueno dos Reis Martinez pela ajuda e comentários deste manuscrito. Finalmente, à Priscila Lazoski pela confecção das figuras.

Recebido em 30.XI.1995; aceito em 17.X.1996.

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Datas de Publicação

  • Publicação nesta coleção
    14 Jul 2009
  • Data do Fascículo
    1996

Histórico

  • Aceito
    17 Out 1996
  • Recebido
    30 Nov 1995
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