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Two populations of Crassostrea iridescens were sampled off Mazatlan and in a zone free of anthropogenic activity. The .bivalves were collected from February 1992 to February 1993. Concentrations of Cd, Co, Cr, Cu, Fe, Mn, Ni and Zn were determined by flame atomic absorption spectrophotometry. Annual mean values in the sampling

Heavy metals in.the rock oyster <i>Crassostrea iridescens</i> (Filibranchia:. Ostreidae) from Mazatlan, Sinaloa, Mexico