Distribuição do metal mercúrio em atum (Thunnus albacares) e pescada bicuda (Cynoscion microlepidotus) capturados no litoral do Rio de Janeiro, Brasil

Abstract

The mercuric kinetic in organs, muscular tissue, and stomach contents of two species of marine fish predators was evaluated by the identification of the places showing higher accumulation of the metal. For the analytical process, the used technique was cold vapor atomic absorption spectrometry. The results demonstrated that the distribution of Hg in the analyzed portions presented wiede dispersion. For Thunnus albacares, the variation was of 0.004μg.g -1 in the liver, gills and spleen, and 0.172μg.g-1 in the muscular tissue. For Cynoscion microlepidotus, the variation was between 0.013μg.g-1 in gills and 0.250μg.g-1 in muscular tissue. The latter was the portion of higher concentration of this metal in both species, T. albacares = 0.080±0.050μg.g-1 and C. microlepidotus = 0.187±0.030μg.g-1, while less concentrations were found in the gills (0.029±0.031μg.g-1) in C. microlepidotus and in the eyes (0.013±0.008μg.g-1) in T. albacares.