Effects of sub-lethal doses of an organophosphorus insecticide sumithion on some hematological parameters in common carp,Cyprinus carpio

Toxicological effect of an organophosphorous pesticide sumithion was studied in common carp,cyprinus carpio. acute toxicity of sumithion (96 h lc50 value 8.05 ppm) was first determined. then the fish were exposed to three sub-lethal concentrations (0.8,1.6 and 3.2 ppm) of sumithion for 24,48,72,and 96 h,at the end of which blood glucose levels and hematological parameters were analyzed. the blood glucose level increased significantly in higher concentrations (1.6 and 3.2 ppm) compared to control (0 ppm) during the toxicity of sumithion. on the other hand,the hemoglobin,rbc and hematocrit values declined significantly with the increasing concentration of sumithion. the mcv and mch showed significant increases in higher concentrations. the present investigation revealed that sumithion has adverse effects on the biochemical and hematological parameters,which might alter physiological functions in the fish body. copyright 2015 zoological society of pakistan.