http://dx.doi.org/10.5007/2175-7925.2016v29n1p67Estudos sobre caracterização da dieta de peixes representam um instrumento que permite determinar relações nas cadeias tróficas, definir hábitos alimentares e a ocupação de habitats e determinar os nichos tróficos das espécies. Para a caracterização da dieta de Rhinodoras dorbignyi, foram realizadas seis coletas bimestrais no alto rio Paranapanema, SP, durante o período de abril de 2010 a fevereiro de 2011. Dos 63 indivíduos capturados, 30 apresentaram algum conteúdo no estômago, sendo utilizados neste estudo. A dieta desta espécie foi determinada utilizando de dois métodos: (i) Índice Alimentar (%IAi); (ii) e a interpretação gráfica da estratégia alimentar. A partir dos resultados obtidos é possível inferir que R. dorbignyi é uma espécie insetívora, sendo que itens de origem autóctone apresentam grande contribuição em sua dieta.
Summary
Length–weight relationships (LWRs) for 35 freshwater fish species from the SP/RJ coastal basin in Brazil are presented in this paper. Fishes were captured between 2011 and 2015 on an irregular basis using electrofishing, sieves, trawl nets, cast nets and fish‐traps. In this study new LWRs are reported for 28 species, plus the total weight and length for 34 and nine species, respectively. The study provides new information on less‐studied species and can serve as a basis for management and conservation in this area.
The introduction of exotic species, although harmful to the natural environment, still occurs accidentally, intentionally or as a strategy of biological control. In this work, a specimen of Betta splendens was collected and recorded for Northeastern Brazil, a fish of the family Osphronemidae, originally from Asia. This species has the potential to compete with the native species, causing alterations in the natural community. The record of this species in Brazilian environments and the lack of diagnostic works on this region makes this work of special importance and as an incentive for future investigations.
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