Limnology is the study of aquatic ecosystems. The quality of water is extremely variable in physical, chemical and biological characteristics.This book is describes about 02 water bodies of Bhalki and Bidar, India in special reference to inter relationship of physico-chemical and biological factors. Which include collection of data pertaining to meteorological conditions like temperature, rainfall and humidity; methodology, data preparation and interpretation with statistical tools of physico-chemical status of water, Primary production and phytoplankton composition such as pH, alkalinity,...