Hydrobiologocial Studies of Foy Sagar Lake, Ajmer

The study of physicochemical characteristics indicates the nature of the Foy Sagar lake water is alkaline, moderately hard and nutrient rich with low value of dissolved oxygen. Most of the nutrients exhibit maximum concentration in summer months. The water quality is deteriorating rapidly due to intense human activities and infusion of pollutants from the surroundings. These include silt, dissolved solids and nutrients like phosphates, nitrates and chlorides etc. Among the zooplankton, rotifers are good indicators of water quality. Rotifers of genus Brachionus and Keratella are abundant in water of Foy Sagar lake. The species composition and species diversity also point towards the polluted nature of the lake water.