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This study aimed to investigate the concentrations of Cd, Cr and Pb in the water and sediment, and to compare the concentrations of these metals in fish muscles, the levels of plasma oxidative stress biomarkers (malondialdehyde and protein carbonyl) and the genetic differentiation between experimental tilapia fish from the contaminated reservoir near municipal landfill and the reference area after chronic exposure to the metals. The concentrations of Cd, Cr and Pb in the water exceeded the Thailand water quality standard, whereas the concentration of Cd in the sediment exceeded the Thailand soil quality standard. The concentrations of these metals in fish muscles were below Thailand food quality standard. In comparison to the reference fish, the fish in the landfill reservoir revealed a significant increase in malondialdehyde and protein carbonyl (p < 0.05). The dendrogram results demonstrated values of genetic similarity for the fish from the reference and the landfill areas at 0.84-0.94 and 0.65-0.97, respectively, implying that the values of genetic differentiation as a consequence of genotoxicity of the fish from the landfill were greater than those of the fish from the reference area. The results indicate that chronic heavy metal exposure could induce oxidative stress and genotoxicity of tilapia fish in the reservoir near municipal landfill.

OXIDATIVE STRESS AND GENETIC DIFFERENTIATION IN EXPERIMENTAL TILAPIA FISH EXPOSED TO HEAVY METALS IN A RESERVOIR NEAR A MUNICIPAL LANDFILL