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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.18 no.4 Curitiba Dec. 2001

http://dx.doi.org/10.1590/S0101-81752001000400016 

Mudança na dieta da traíra Hoplias malabaricus (Bloch) (Erythrinidae, Characiformes) em lagoas da bacia do rio Doce devido à introdução de peixes piscívoros

 

Diet changes of the trahira Hoplias malabaricus (Bloch) (Erythrinidae, Characiformes) due to piscivorous introductions in Rio Doce valley lakes

 

 

Paulo dos Santos Pompeu; Alexandre Lima Godinho

Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais. Avenida Antônio Carlos 6627, 31270-901 Belo Horizonte, Minas Gerais, Brasil. E-mail: pompeups@uai.com.br

 

 


ABSTRACT

Two piscivorous fishes, peacock bass (Cichla monoculus Spix & Agassiz, 1831) (Perciformes) and piranha (Pygocentrus nattereri Kner, 1860) (Characiformes), were introduced in some Rio Doce valley lakes (19º50'S, 42º40'W) for sport fisheries enhancement. As a consequence, small individuals and species were practically vanished in the host lakes. In this study, the effects of peacock bass and piranha introductions on the diet of a native piscivorous fish, the trahira - Hoplias malabaricus (Bloch, 1794) are presented. Trahira's diet from three lakes were was compared with the stomach contentsdiet of trahira's living in another between three lakes with and three withoutstocked with the piscivorous species peacock bass and piranha. In the lakes with introduced fishes species, the consumption of fish was significantly smaller and this food item have been this item partly replaced by aquatic invertebrates. This shift on of trahira's diet to the low abundance of its original prey, is attributed to the small fishes. This diet plasticity adaptative capacity he diet plasticity detected for trahira might be allowing its maintenance in the lakes with peacock bass and piranha.

Key words: Cichla, Pygocentrus, Hoplias malabaricus, diet, species introduction


 

 

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AGRADECIMENTOS. Ao Instituto Estadual de Florestas e ao programa de pós-graduação em Ecologia, Conservação e Manejo de Vida Silvestre da UFMG pelo apoio à coleta dos peixes, e a FAPEMIG pela bolsa concedida ao primeiro autor.

 

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Recebido em 27.XII.2000; aceito em 22.X.2001.

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