The biochemical content like glycogen was estimated quantitatively in the tissue liver and kidney of control and cadmium chloride treated fish. The experimental fish were exposed to higher and lower sub lethal concentration (one-tenth and one-third of the 96hr LC₅₀ value) of cadmium chloride for 15, 30 and 45 days at 35^oC. In both the tissues a significant reduction in glycogen level has been observed on the 45^th day of exposure using statistical F test.