Heavy metal pollution is a great concern to the environmental is widespread and non-degradable. It seems to be man`s worst endeavor in his attempt to augment industrial development. Heavy metals are bioaccumulative and relatively stable as well as toxic/carcinogen and therefore require close monitoring. Concentration of zinc, chromium, copper, cadmium and lead were investigated in the gill, gonads, skin and muscle tissues of six commercially edible fishes from upper stretch of the Ganga River at West Bengal, India. The study area receives a wide variety of wastes generated by municipalities and the industries like paints and pigments, metal processing industries, thermal power plants, electro-processing industries etc. situated on the both side of the river Ganga. Simultaneous analysis of the metals was also carried out in the sediment and aquatic phases to monitor the degree of contamination. The results of this study indicated that the six commercially edible fishes through food, water and sediment leading thereby to bioaccumulation took the metals present in the river ecosystem. Heavy metal concentrations in the tissues tended to vary significantly among season and monsoon period showed particularly high metal concentration compared to pre-monsoon and post-monsoon. Muscle tissues and gill showed higher concentration of zinc, chromium, copper, cadmium and lead than gonads and skin (p< 0.05). Highest concentration of zinc, chromium, copper, cadmium and lead were detected in gill tissues (p < 0.05). Lowest concentration observed in gonads of fish sampled from upper course of the River Ganga. Further, metal accumulation showed high degree of species specificity, where the order of accumulation of heavy metals was zinc>copper>chromium>cadmium>lead.
A.K. Bhattacharya, S.N. Mandal and S.K. Das, 2008. Heavy Metals Accumulation in Water, Sediment and Tissues of Different Edible Fishes in Upper Stretch of Gangetic West Bengal. Trends in Applied Sciences Research, 3: 61-68.