Heavy Metals in Farm Sediments, Feeds and Bioaccumulation of Some Selected Heavy Metals in Various Tissues of Farmed Pangasius hypophthalmus in Bangladesh

Abstract

In these studies, we had determined the concentrations of heavy metals in P. hypophthalmus including sediment, water and Fish organs (gills, flesh, and liver) in order to evaluate the possible risk of consumption. Concentration of heavy metal was not significantly presence of water whereas heavy metal in sediment Ni: 26.31 mgkg-1-33.03 mgkg-1; Cu: 13.00 mgkg-1-23.20 mgkg-1; Cr: 7.31 mgkg-1-15.41 mgkg-1; Pb: 6.43 mgkg-1-8.65 mgkg-1; Cd: BDL (Below Detection Limits) were higher than that of fish parts (Cu-11.96, Pb-6.29, Cd-0.16 Ni-4.23, and Cr-11.03) mgkg-1Metal concentration in fish feed followed the sequence Cr>Cu>Ni>Pb>Cd and found that both farm feeds were more or less same quality except one or two metals. The concentration of heavy metals recorded in the fish parts also indicated a certain degree of bio-accumulation. The concentration of all metals in water were below the WHO and FEPA recommended limits and suggested that the water of the farm are safe and suitable for use, but the concentration of heavy metals in gills, kidney and liver of the fish are high beyond the tolerable level, which indicated that as far as these metals are concerned, the fish is unfit for human consumption.