Basic limnology and fish biodiversity is a pioneering treatise on the basics of limnology which is indispensable for any beginner in the field of limnology and wetland biology. The book has been enriched by a monograph of the river Kopili in a remote corner in Assam, hitherto unexplored. The authors report about the limnology and habitat features of the river (including some amount of works on spatial analysis on a GIS platform), the physico-chemistry of the river water, the plankton communities and last but not the least the bewildering fish biodiversity for which the river is a nature's gift of beauty in diversity. The book would be useful for B.Sc. M.Sc. M.Phil, PhD students of colleges and universities of India and neighbouring countries as well for the policy makers in the field of limnology and fisheries.