Comparison of all fish species sampled in the same site was shown in Fig. 2a, Fig. 2b, Fig. 2c and Fig. 2d. Although heavy metal concentrations in fish were varied in different locations, significant high Pb and Ni concentration was found in tilapia (Fig. 2a) and mandarin fish (Fig. 2c) in all locations, respectively. In the PRD, which is influenced by intensive and extensive As and Pb concentrations (mg/kg, ww) of fishes in different locations. Within each graph, means with the same letter in the same location are not significantly different according to Duncan’s Multiple Range Test (p < 0.05).