Estudo do sistema digestório de duas espécies de peixes Siluriformes (Hypostomus auroguttatus e Pimelodus maculatus) no reservatório da UHE de Funil, RJ

Abstract

The present work is a multidisciplinary study, focusing on the reservoir environmental conservation. Quarterly fish sampling were performed between 2003 and 2004 in Funil reservoir for collecting two fish species of Siluriformes (Hypostomus auroguttatus and Pimelodus maculatus), species bottom dwelling, for assessing occurrence and relationship with environmental variables (spatial and seasonal) Additionally, the digestive systems of the two species were described by histological techniques, and analyses of enzymatic activities and microbiota in sections of digestive tract (liver, stomach, intestine), were performed. Metal concentrations were determined in muscles and liver of the two species. Those approaches aim to compare fishes between the reservoir and the river (downstream the dam) and seasonal variation associated to environmental gradients. The hypothesis of filter of pollutants attributed to reservoirs was not corroborated for the Funil reservoir for the pollutants brought into by the Paraíba do Sul river.