Brackish water wetlands of Sundarbans constitute important fishery resources and an integral part of the fastest growing aquaculture in the world. Wetlands of Sundarbans is a unique repository of biodiversity. The enormous abundance and diversity of algae of brackish water wetlands have an impact on wetland ecosystems. This book represents physico-chemical characters of brackish water wetlands, algal diversity, zooplankton, fishes and role of algae in aquatic ecosystems of Sundarbans. Dwindling expertise in taxonomy impairs the concept of biodiversity; therefore, this book will be an impetus for filling the gap of documentation of algal species. This book provides a wealth of information for those studying and working with algae and will be helpful not only to botanists, zoologists, environmentalists,researchers but to decision makers as well.