Bioaccumulation profile of heavy metals in the liver tissues of Wallago attu (MULLEY) from Kalpani River Mardan, Khyber Pakhtunkhwa Pakistan

摘要

Weexamined the bio accumulation profile of 05 heavy metals (Pb, Cr, Cd, Ni and Zn) in the liver tissue of fresh water fish Mulley, Wallago attucollected from 04 different polluted sites of Kalpani River in Khyber Pakhtunkhwa province Pakistan. The heavy metals concentration recorded in the liver of Wallago attuwas determined by using Perkin Elmer AS 3100 flame atomic absorption spectrophotometer. Metals bio accumulated in the liver tissue in the order of Cd>Cr>Zn>Niwith no detection of lead (Pb) in any fish sample. Cadmium (Cd) was the highest and nickel (Ni) was the least accumulated metal in the fish liver. Mean concentrations of detected four heavy (Cr, Cd, Ni, Zn) in theliver of Wallago attu in all 04 samples were 0.90±0.8118, 3.33±1.3595, 0.04±0.0250, 0.72±0.1937 μg g -1 (wet weight).Overall, cadmium (Cd) was more accumulated in the fish liver as compared to other heavy metals. At present cadmium has crossed the permissible limits of FAO (1983). Our findings suggest that fish liver have comparatively more chemicalaffinity to bio accumulate cadmium (Cd) as compared to heavy metals like Zn, Cr and Ni