Not only scientists, but common man and bureaucrats are also worried about the increasing threats to our aquatic ecosystems. Therefore basic knowledge about the aquatic ecosystems, pollution and conservation is essential. In this context 'Advances in Aquatic Ecology (Vol. 5)' focuses the issues to preserve these precious ecosystems. This volume is a unique compilation of 42 research papers which discusses exhaustive studies on physico-chemical environment, planktonology, fisheries, toxicology etc.With its application oriented and interdisciplinary approach, the book would be immensely useful to students, teachers, researchers, scientists, policy makers, environmental lawyers and others interested in aquatic ecology. The chapters in this book have been contributed by eminent scientists/academicians active in the areas of aquatic ecology.