Areas exposed to high environmental concentrations of contaminants from anthropogenic or natural sources are called “hotspots”. Hotspots include estuaries, bays, lagoons and river mouths, which are generally associated with highly urbanized and industrialized areas(DEQ, 1998; WHO, 2012). In this sense, regular environmental monitoring of these hotspots, particularly in estuarine areas, using bioindicator species from different trophic levels, provides relevant information to understand species' biological responses towards contamination.