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To evaluate the relative bioavailability of Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn in the coastal waters of one selected site in Mazatlán Harbor, different filter feeder organisms, an oyster (Crassostrea corteziensis), a mussel (Mytella strigata) and a barnacle (Fistulobalanus dentivarians), were sampled during 1 year. Seasonal and interspecific variations in some metal concentrations were evident, especially for Cd, Ni, Pb and Zn. In contrast with Fe, Pb and Zn, the concentrations of Cd varied accordingly in both bivalves. Even though the organisms live in the same site and have a common feeding mechanism, accumulated body Cd concentrations were different. Mussels concentrated significantly higher levels of Ni than the other organisms, while barnacles were better concentrators of Cd, Pb and Zn. A relationship existed between the concentrations of Cd, Fe and Zn in the soft tissues of the two bivalves, which is useful in …