Effect of Synthetic Pyrethroid-Lambda-Cyhalothrin on Haematological Parameters of Freshwater Catfish

Abstract

The most crucial diagnostic method for toxicological investigations of contaminants is the analysis of haematological parameters. The effects of different contaminants in the aquatic environment cause a variety of physiological and metabolic changes in fish. So, this study attempts to study the effect on blood parameters of fresh water catfish Clarias batrachus that are exposed to lambda-cyhalothrin. Enumeration of red blood cells and white blood cells were done. Haemoglobin levels were estimated. Fishes exposed to the higher sub-lethal concentration showed a significant decrease (P<0.05) of 29.94% of total erythrocytes after 45 days of exposure to lambda-cyhalothrin. On comparison with the control group of fishes, haemoglobin content of the pyrethroid-exposed fishes of both groups showed a significant decline (P<0.05) on the 15th, 30th and 45th day of exposure. The total leucocyte count of the fishes exposed to the higher and lower sub-lethal concentration of the pyrethroid also showed a significant decline (P < 0.05) in comparison to the leucocyte count of the control group of fishes.