The concentration of heavy metals in seafood samples (mg / kg) 11 Seafood HMs Snake-head fish Catfish Stuffed Snail Tiger Shrimp Mean (Min, Max) N * (n,%) Mean (Min, Max) N * (n,%) Mean (Min, Max) N * (n,%) Mean (Min, Max) N * (n,%) As 1.18 (1.18 - 1.19) - 1.66 (1.56 - 1.80) - 0.80 (0.77 - 0.81) - 0.80 (0.77 - 0.81) - Pb 0.08 (0.07 - 0.09) 0 0.10 (0.08 - 0.12) 0 1.24 (0.72 - 1.76) 10 (100) 1.24 (0.72 - 1.76) 10 (100) Cd 2.30 (1.91 - 2.74) 10 (100) 1.06 (0.94 - 1.18) 10 (100) 1.62 (1.35 - 1.97) 10 (100) 1.62 (1.35 - 1.97) 10 (100) Cr 2.12 (1.96 - 2.31) - 2.25 (2.04 - 2.47) 1.46 (1.03 - 1.87) - 1.46 (1.03 - 1.87) - Hg ND 0 ND 0 ND 0 ND 0 N *: No sample over MLs; ND: not detected 3.2.