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

2001; Sociedade Brasileira de Zoologia; Volume: 18; Issue: 4 Linguagem: Inglês

10.1590/s0101-81752001000400016

1806-969X

Paulo dos Santos Pompeu, Alexandre Lima Godinho,

Fish Ecology and Management Studies

Dict changes of the trahira Hoplias malabariCIIs (Bloch) (Erythrinidac, Characiformes) due to piscivorous introductions in Rio Doce valley lakes.Two pisei vorous fishes , peacock bass (CicMa /IIo//Owlus Spix & Agassi z, 1831 ) (Perciformes) and piranha (Pygocenlrus Ilauereri Kner, 1860) (Characiformes), were introduced in some Rio Doce valley lakes (19°50 ' S, 42°40' W) for sport fisheries enhancement.As a consequence, small individuais and species were practically vanished in the host lakes.In this study, the effects of peacock bass and piranha introductions on the diet ofa native piseivorous fish, the trahira -Hoplias malabaricus (Bloch, 1794) are presented.Trahira's diet from three lakes were was compared wilh 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 thi s item partly replaced by aquatic invertebrates.This shift on of trahira's diet to the low abundance of its original prey, is atlributed to the small fishes .This diet plasticity adaptative capacity he diet plasticily detected for trahira might be allowing its maintenance in the lakes with peacock bass and piranha.