Abstract
Fresh water bodies are facing serious type of pollution of heavy metal. Heavy metals are a metal of relatively high density, relative atomic weight or atomic number. Heavy metal are either essential nutrients (like cobalt, zinc) and other may be toxic (like cadmium, mercury, lead). Heavy metals cannot be easily removed by processes like oxidation, precipitation or other processes because they are stable compounds. For aquatic organisms and humans, Cadmium is a toxic non-essential heavy metal that is introduced to environment as a result of the weathering of soil/ rocks, from volcanic eruption /from various human activities involving mining and processing of ore, use of fertilizers and pesticides. Cadmium can affect biological functions in fish and cause severe histopathological, biological and physiological changes in various fish species. The three body parts of fish had been taken gills, muscle and liver because the heavy metal enter in body by three possible ways gills, skin and digestive tract in fish and then transported by blood to either a storage point such as bone, or to liver for transportation. The mean highest values of concentrations of heavy metal in dry tissues of all sampled fish species collected from Sirpur Lake and Bilawali Lake is pointed out in results. These levels might be due to anthropogenic inputs and industrial activity around the lake. The change in season may also contribute to differences in uptake of heavy metal. The purpose of this study is to check the tissue-specific heavy metal accumulation in the fresh water fish (Catla catla) in two different seasons.
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