Year: 2019, Issue: June

Toxicologial impact and residual accumulation of cadmium chloride on a fresh water fish, Oreochromis mossambicus, Peters under laboratory controlled conditions.
Pradeep Kumar Behera and A. K. Panigrahi
Residual cadmium, Exposed fish, Fish tissues, Accumulation, Excretion
The result showed that the MAC value of cadmium chloride was found to be 1.325 mg l-1 for 30th days and to be on the safe side 1.30 mg l-1 was considered for 28th days of the exposure for sub-lethal toxicological studies. The LC10, LC50, LC90 and LC100, values after 28th days were recorded to be 1.38, 1.74, 2.25 and 2.68 mg l-1 of cadmium chloride. No mortality of fish was recorded in the control set through out the period of toxicity testing. The control fish brain, liver, muscle and gill did not show any accumulation of cadmium indicating absence of any background cadmium and also indicated that the control aquarium was uncontaminated. The brain showed the least and gill & liver tissues showed the maximum accumulation after 28th days of exposure. The exposed muscle tissue showed higher accumulation when compared to brain but less than liver and gill filaments after 28d of exposure. The exposed fishes were transferred to toxicant free medium for 28th days to check the possible excretion of the metal from fish tissues. The residual cadmium content increased during recovery studies, might be due transfer of the metal from other tissues to the brain tissue. Whereas, excretion of this metal cadmium was observed in liver, muscle and gill tissues. The liver could excrete 21.9% after 28th days of recovery. The gill filaments showed the highest excretion to the tune of 77.3% followed by muscle, where 62.9% excretion was noted. Hundred percent recoveries were not observed in the cadmium exposed fishes.

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