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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.15 no.4 Curitiba Dec. 1998

http://dx.doi.org/10.1590/S0101-81751998000400017 

Alimentação de Oligosarcus longirostris Menezes & Gèry (Osteichthyes, acestrorhynchinae) do Reservatório de Salto Segredo, Paraná, Brasil

 

Feeding of Oligosarcus longirostris Menezes & Gèry (Osteichthyes, acestrorhynchinae) of the Salto Segredo Reservoir, Paraná, Brazil

 

 

Ana Maria GealhI; Norma Segatti HahnII

IDepto de Biologia Geral, Universidade Estadual de Ponta Grossa. Praça Santos Andrade, 84010-790 Ponta Grossa, Paraná, Brasil
IINupelia, Universidade Estaudal de Maringá. Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brasil

 

 


ABSTRACT

In the feeding study of O. longirostris Menezes & Gèry, 1983, 211 stomachs from fish caught between March 1993 and February 1994 were analysed. Diet composition was analysed by the index of relative importance which deals with the numerical and gravimetric occurrence frequency. Results indicated that the species is piscivorous and its preferential food consisted oíAslyanax sp. 2. It was also found that Astyanax sp. 3 became an important food item, depending on the site of capture and its availability. Availability of prey seems to have a strong influence on the diet of O. longirostris. This same tendency has been observed during the different seasons of the year. Ontogenetic changes have also been found in the basic diet.

Key words: Oligosarcus longirostris, diet, piscivorous, Salto Segredo Reservoir.


 

 

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AGRADECIMENTOS. Agradecemos ao Nupelia (Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura) pelo apoio logístico, ao Convênio Uem/Copel pelo apoio financeiro, ao Prof. Dr. Ângelo A. Agostinho pela oportunidade e a Vera. Lúcia L. Almeida pela leitura e sugestões.

 

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Recebido em 19.IX.1997; aceito em 17.XI.1998.

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