This study was performed to investigate the heavy metal contents of freshwater fishes. The samples of 24 species were collected at 7 areas located on the Mankyung River during September in 1987. And then the contents of lead, cadmium, copper and zine were analyzed by atomic absorption spectrophotometer. The results were summarized as follows ; 1. The mean value of lead, cadmium, and copper contents of fishes collected in the downstream were significantly higher than those of upstream. 2. The mean lead content of C. auratus was the highest $1.50{pm}0.98{mu}g/g$ in viscera and statistically significant difference from muscle content. 3. The mean cadmium content of C. auratus was the highest $0.087{pm}0.054{mu}g/g$ in viscera and significantly higher than that of muscle. 4. In the copper contents, the viscera of C. auratus was the highest $5.25{pm}0.94{mu}g/g$ and significantly higher than that of muscle, skeleton and gill. 5. The mean value of zinc content of C. auratus was shown the order of gill, skeleton, viscera and muscle.