Fig. 3

Concentrations of heavy metals in abdominal muscle of crayfish from different districts. -As, -Cd, -Hg, -Pb. Different lower-case letters on columns for the same heavy metal are significantly different (p < 0.05). Heavy metal concentration below the LOQ was substituted by half the LOQ during the analysis. LOQ of As, Cd, Hg and Pb were 1 µg/kg, 1 µg/kg, 1 µg/kg and 5 µg/kg, respectively