Caracterização química e microbiológica de moluscos bivalves coletados, cultivados e comercializados na costa do estado do Rio de Janeiro

Abstract

Oyster and mussel are commonly collected, cultivated and marketed for human consumption, although the filter feeder habits may concentrate chemicals and microorganisms, mainly in urban coastal environments. This study seasonally monitored metals, total coliform and E. coli in bivalve mollusks collected, cultivated in estuarine and open sea regions of the State of Rio de Janeiro, and in organisms commercialized in supermarkets from the municipality of Rio de Janeiro, providing knowledge about the importance of location where organisms are collected or cultivate, and about the commercialized bivalve quality. Oysters collected in the estuary, mainly in the dry season were more susceptible to E. coli contamination than organisms collected and cultivated in open sea areas. Considering the metal distribution, oyster concentrations did not present important temporal and spatial variations among the coastal environments, excepted for the higher values of terrigenous metals in the estuarine oyster. For metal concentrations in the commercialized mussels in the Rio de Janeiro markets, values had large temporal variation, with higher values in the rainy season and considerable mussel metal variation among different supermarkets, with some samples presented higher (Zn) or similar (Pb) values compared to the legislation reference values.