Acute and chronic toxicity of cadmium to male Clarias batrachus Linn. with special reference to their haematological changes

Mr. Kishore Dhara; Mr. Dip Mukherjee; Dr. Nimai Chandra Saha

Volume : III, Issue : XII, December - 2014

Acute and chronic toxicity of cadmium to male Clarias batrachus Linn. with special reference to their haematological changes

Mr. Kishore Dhara, Mr. Dip Mukherjee, Dr. Nimai Chandra Saha

Abstract :

The present study was done to evaluate the acute and chronic toxicity of cadmium to Clarias batrachus along with its effects on ethological and haematological changes of fish. 96h median lethal concentrations (LC50) of cadmium chloride along with its 95% confidence limits was 82.66 (75.09-90.54) mg/l. Excessive mucous secretion in the body surface, signs of stress like erratic fin movement, hyperactivity, difficulty in eathing, suffocation and surface attachment of fish followed by death were recorded in the higher concentrations (82.5, 92.5 and 95.0 mg/l) during 72 and 96h of exposure. During chronic toxicity tests, total erythrocyte count (TEC), haemoglobin (Hb) content, haematocrit (Hct) percent, mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), blood triglyceride, cholesterol, serum albumin, serum globulin and serum albumin-globulin ratio of Clarias batrachus varied significantly with increasing exposure time (60 and 90 days) at all sublethal concentrations of cadmium (4.14 and 8.27 mg/l).