At the time when environmental pollution is increasing day-by-day this book has been prepared for taking care of the aquatic environment. This book present the most important aspects of aquatic environment such as ecology, pollution, impact, assessment, conservation and management of water resources and aquaculture, in a single volume. It elaborates the pollution control aspects of selected polluted wastes containing phenol, benzo-a-pyrene and mercury. Included in the book are actual scientific research studies/ reviews written by the eminent scientists of the field. This book is intended as a research oriented book for researchers, scholars and scientists. Administrators, decision makers, planners and academician would also find it an invaluable reference. It would also serve as a supplementary reading book for the post graduate students in environmental science.'