The exposure of Channa punctatus to sub lethal concentrations of deltamethrin led to anemia, as indicated by the significant decrease in Hb, TEC, and PCV values leading to anemia. The anemia might have led to a fall in the red blood cell count, hemoglobin concentration and haematocrit volume. The anemic condition in fish results from an unusually low number of red blood cells or too little hemoglobin in the red blood cells. According to Pamila et al., (1991) the pesticide induced anemia in fish may be due to the inhibitory effect of the toxic substance on the enzyme system responsible for the synthesis of haemoglobin. It may also be due to impaired intestinal absorption of iron, as suggested by Joshi et al., (2002).