Freshwater mussels and crayfishare commonlyused asbiomonitors oftrace metals. In the present study, the concentrations of tenmetals were determined in mussels (Unio elongatulus eucirrus) and crayfish (Astacus leptodactylus) collected from the KebanDam Reservoir in Turkey. The significant spatial differences in concentrations of studied metals except As in mussels were notfound. However, Co, Cr, Cu, and Zn concentrations in mussels and As, Co, Cu, Fe, Pb, and Zn concentrations in crayfish showedsignificant seasonal differences. As, Cd, and Mn levels in mussels were about nine times higher than those in crayfish. Theconcentrations of Cd, Cr, Cu, Pb, Zn, and inorganic As in crayfish and mussels were lower than maximum permissible levels.When compared with other biomonitoring studies using mussels and crayfish, high concentrations of As, Cd, Co, Cr, and Ni inmussels and Cr and Ni in crayfish were observed due to lithogenic sources and anthropogenic activities in the basin.Bioconcentration factor values of Fe, Mn, Cd, and Zn in mussels and Zn, Cu, Fe, and Co in crayfish were > 1000, whichindicates that bothU. e. eucirrusandA. leptodactylushave potential to bioaccumulate these metals. Therefore, attention shouldbe paid to mussels and crayfish from ecological and human health perspective, because they are potential vectors of metals tohigher trophic levels.

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