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Abstract

The excessive occurrence of heavy metals in natural loads has now-a-days become a matter of concern for the health of aquatic ecosystem. Heavy metals like Copper, Lead, Mercury, Cadmium, Nickel and Chromium are mainly responsible for water pollution. Metal pollution is a global problem growing at an alarming rate and aquatic organisms are continuously exposed to elevated levels of metals seriously threatening the whole ecosystem. The current experimental study of bioaccumulation of Copper, Lead and Cadmium in fish Clarias batrachus (Linn.) was conducted on 10 th , 20 th and 30 th days of exposure. The physico-chemical characterization of water was done as per standard methods (APHA, 2012). The tissues samples were analyzed using Inductively Coupled Plasma Atomic Emission Spectrophotometer (ICP-AES) and the results were expressed as g/gm.Enhanced bioaccumulation of all the heavy metals was observed with increased time duration. Experimental tissues of kidney and liver were found to accumulate highest amounts of heavy metals in comparison to the control tissues of respective organs. Accelerated release of heavy metals into the aquatic environment leads to serious water pollution problems, persistence and bioaccumulation. Therefore, it is important to know the various sources of discharge of heavy metals into aquatic ecosystems throughout the world. The present study was undertaken to assess bioaccumulation of some heavy metals in the fish, Clarias batrachus (Linn.) and to address its correlative impacts.

Bioaccumulation of Heavy Metals in Some Tissues of Fish, Clarias batrachus Exposed to Sub-lethal Concentration of Nickel Sulphate and Potassium Dichromate

“…In the present study, the bioaccumulation of chromium in the fish tissues were found in the order of liver > kidney> gill (Table 1) where as the bioaccumulation of nickel was found in the order of liver > kidney> gill(Table 3). A similar type of bioaccumulation trend was reported for cadmium in 30 days of exposure (Gandhewar and Zade, 2019). In the case of chromium exposed fish, even though the quantity of chromium accumulation in tissue was less in the case of gill when compared to liver and kidney, but the pattern of accumulation showed a continuously increasing trend until the 30 th day of exposure in all the tissues (Table 1).…”