Abstract
Hill park lake, a small, shallow and recreational water body of Karachi (Pakistan) was studied through monthly survey for six months from April, 2011-December, 2011 for physico-chemical parameters and zooplankton abundance. Air and water temperature varied from 30°C to 35°C and 27 C to 33°C, respectively. pH ranged between 5.5-6.5, salinity from 0.6 to 0.766 mg/L, dissolved oxygen and acidity ranged between 0.453 to 2.834 mg/L and 105 to 225 mg/L, respectively, phosphate 48 to 95 mg/L and sulphate 13 to 51 mg/L. Among total zooplankton population, 4 groups included Rotifera, Cladocera, Copepoda and Ostracoda were identified and quantified. These zooplankton were abundant in September but they declined in May. The order of dominance of zooplankton was Copepoda > Ostracoda > Rotifera > Cladocera .
