Haematological changes in a freshwater fish, Labeo rohita (Hamilton, 1822) exposed to raw sewage

The effect of raw sewage discharged into Perur Chettipalayam Lake on an economically important fish, Labeo rohita (Hamilton, 1822) was studied. The calculated 96 hour LC₅₀ for the water sample at 95 percent confidence limit was 39.5% with a lower limit of 33.80% and an upper limit of 44.67%. A noticeable difference of low values of haematological parameters was observed when compared to the control fish. However, the WBC count increased in the sewage treated fishes. The study revealed haemotoxicity in Labeo rohita due to exposure to sewage contaminated water.