Acute toxicity and impact of an organophosphate pesticide, chlorpyrifos on some haematological parameters of an Indian minor carp, Labeo bata (Hamilton 1822)
2015
Samajdar, Ishita | Mandal, Dipak Kumar
Chlorpyrifos (CPF) is a widely used organophosphate pesticide and toxic to aquatic organisms including fish. In the present study, an attempt was performed to estimate the 24h, 48h, 72h, and 96h LC50 value of chlorpyrifos for Labeo bata and the resultant values were found to be 257.03μg L⁻¹, 208.92μg L⁻¹, 177.82μg L⁻¹ and 109.64μg L⁻¹ respectively indicating tremendous toxicity of chlorpyrifos to the studied fish. The fish were exposed to chlorpyrifos in two sublethal concentrations, 30.8μg L⁻¹ and 61.6μg L⁻¹ for 24h, 48h, 72h and 96h and effect of CPF on the haematological parameters of the fish were studied. The result showed that CPF could cause anaemia with significant (p<0.001) decrease in RBC count, haemoglobin (Hb), packed cell volume (PCV) and mean corpuscular volume (MCV) in the pesticide exposed fish. However, mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) did not vary significantly. White blood cell (WBC) significantly increased (p<0.001) in CPF exposed fish as a protective response. These results suggest that CPF is toxic and has disruptive effect on the blood of fish.
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