The present book is compendium of recent original research in the field of aquatic ecology. It is an assemblage of up-to-date information of rapid advances and developments taking place in the field of aquatic ecology. The chapters in the book have been contributed by eminent scientists/academicians. The book is a unique compilation of 37 chapters which discusses exhaustive studies on fish biology, planktonology, physico-chemical environment, toxicology, physiology 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 the book have been contributed by eminent scientists/academicians active in the areas of aquatic ecology