This study focuses on seasonal dissimilarities of zooplankton structure of selected lentic habitats in and around the Hospet city, Karnataka state. Three lentic habitats were identified and sampling was done in the identified four location of the selected water tanks and assessed for its water quality status based on its physico-chemical parameters (temperature, pH, total dissolved solids, hardness, calcium, phosphate, nitrate and dissolved oxygen), during February 2015 to January 2016. A total of 16 species belonging to four groups of zooplankton like 4 protozoan, 4 rotifera, 3 cladocera and 3 copepodain the present study. The physico-chemical parameters of water were compared with standard values recommended by BIS and WHO. Significant correlation in water quality and zooplankton abundance were observed in different seasons. In the present study, the total zooplankton population was low in summer, moderate in pre monsoon, monsoon and high in post- monsoon. The zooplankton structure was more in the Daroji water tank to the lowest at Kampli tank water then Somalapura water tank. Zooplankton populations have shown positive correlation with all the physico-chemical parameters in pre-monsoon, except pH (-0.8686).
