Zooplanktons are defined as animals floating on water surface, with the help of wind, current, and other environmental factors, without use of locomotory organs. They provide an important food source for many aquatic organisms. The major zooplanktons belong to Protozoa, Cladocerea, Copepod, and Rotifer etc. and they act as indicator of health of water body. Zooplanktons are very sensitive to the environmental conditions in which they live in.
Any change in the physico-chemical condition of the water body leads to changes in tolerance abundance, dominance & diversity of the planktons.
Therefore the aim of this paper is to investigate the impact of sewage water on Zooplanktons in a fresh water polluted body (Pampoo Talab) of Dhanbad, Dist. Dhanbad, Jharkhand, India.
This pond was investigated from Jan 16 to Dec 16, once in every month during the morning hours from 8 AM to 10 AM. During the study period , altogether 21 species of Zooplankton were observed, belonging to:- Protozoa 04; Rotifera 10; Cladocera 04; Copepoda 02; Ostracoda 01
Among the different groups of Zooplanktons Protozoans population was abundant. At the site of sewage discharge the population was low.