Estuarine environments and its mangrove forests have ecological importance by serving as habitat for many species. Because the human activities, the levels of metals in these zones have increased and contributed with effects on many organisms, constituting a risk to environmental. The metal concentration the knowledge about their geochemical behavior is a good tool to monitoring the quality of estuarine environments. This research choose the oyster Crassostrea rhizophorae to measure the bioconcentration of metals (Fe, Zn, Mn, Cu, Ni and Al) and the bioavailability in surface water and sediments in a estuarine zone in different seasons of the year. The highest metals concentrations in the water were during dry season, in sediment and biota the highest concentration were in rainy season. Zn and Fe were associated with the oysters growth. The values of metals changed between seasons and some metallic elements could be responsible for growth difference in the oysters.