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Alimentação de Serrasalmus maculatus (Kner, 1858) (Characiformes; Serrasalmidae) no trecho inferior bacia do rio Sorocaba, São Paulo, Brasil = Feeding of Serrasalmus maculatus (Kner, 1858) (Characiformes; Serrasalmidae) in the Sorocaba river, São Paulo State, Brazil

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Author(s): Gilberto Aparecido Villares Junior | Leandro Muller Gomiero | Roberto Goitein

Journal: Acta Scientiarum : Biological Sciences
ISSN 1679-9283

Volume: 30;
Issue: 3;
Start page: 267;
Date: 2008;
Original page

Keywords: dieta | piranhas | predação | rio Sorocaba | diet | piranhas | predation | Sorocaba river

ABSTRACT
Com o objetivo de investigar a alimentação de Serrasalmus maculatus foram coletados 107 indivíduos com a utilização de redes de emalhar de malhas entre 3 a 8 cm entre nós opostos, totalizando 100 m. Os indivíduos apresentaram comprimento-padrão variando entre 62 e 210 mm, e foram representados principalmente por fêmeas e imaturos.Nenhum indivíduo foi capturado em temperaturas inferiores a 21ºC. Ocorreram quatro categorias de itens alimentares nos estômagos analisados, a saber: pedaços de musculatura de peixe, partes de nadadeiras, fragmentos de vegetais e insetos. Foram feitas comparaçõesentre as classes de comprimento mostrando que ocorrem diferenças significativas nos itens alimentares consumidos na maioria dessas classes. A partir da classe de 165 mm, observaram-se apenas os itens musculatura e vegetais. A disponibilidade dos itens no ambiente e a amplitude de comprimento dos exemplares coletados podem estar mascarando a maior diferenciação ontogenética na dieta desta espécie.The aim of this study was to discuss aspects of the diet of Serrasalmus maculatus. Fish were collected using gill nets, whose lengths measured 100 m and mesh diameters varied from 3 to 8 cm. A total of 107 individuals were collected. Their length varied from 62 to 210 mm. They were mainly represented by female and immature individuals. No individual was caught in temperatures below 21ºC. Four feeding item categories were observed: fish muscle pieces, parts of fish fins, plant fragments, and insects. Comparisons made among individual length classes revealed some significant differences within stomach consumed contents. Individuals whose length exceeded 165 mm consumed only parts of fish muscles and plants. The foodavailability in the environment and the class lengths amplitude may, however, have influenced the results, in which ontogenetic differences should not be precisely observed.
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