Sublethal Effect of Quinalphos on Peripheral Haematology of Oreochromis mossambicus (Peters)

Exposure of Oreochromis mossambicus (Peters) for 48 hours to a sublethal concentration of an organophosphorus insecticide Quinalphos EC25 exhibited a significant reduction in total erythrocyte count (TEC) and significant elevation of haemoglobin (Hb), haematocrit (Ht) and erythrocyte sedimentation rate (ESR) values. The erythrocyte constants mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) and erythrocyte indices volume index (VI), colour Index (CI) and saturation Index (SI) of the experimental fish were significantly higher than that of the control fish. The results of the present study showed that the effect of sublethal concentration (30 ppm) of Quinalphos for 48 hours on the peripheral blood of O. mossambicus was macrocytosis and hyperchromia.