Elementos traço e parasitismo em tilápia do Nilo cultivada na região sul de Santa Catarina, estudo de caso

Abstract

Abstract : Due to possible risks for human health, in the last decades, several studies have been realized in evaluating the fish capacity in concentrate trace elements in the internal organs and muscle. This study verifies the bioaccumulation of trace elements and parasitological indexes of 120 Nile tilapia examined in two different properties, named as ?Swine-consorted? using pig manure, and ?Semi intensive?. For trace element analysis, the fish muscle tissue was collected individually in each property. Each portion was weighed, dried in oven at 60°C for 48 h. and analyzed by the fluorescence spectrometry of X rays by energy dispersion (EDXRF). Parasitological analysis followed the routine method for parasites collection, quantification and identification. The predominant element was Zn followed by Fe and As in both properties. Parasitological analyses showed that fish from ?Swine-consorted? facility had greater values of abundance and mean intensity of trichodinids and in fish from ?Semi intensive? higher abundance and mean intensity of monogeneans was found. Nevertheless, no signs of injury to the creation was observed. The contents of the elements Zn, Fe, Cu, As and Hg were above the maximum limits recommended by the Brazilian legislation.