Environmental disaster as well as degradation of natural resource has become the global problem. Accelerated conversion of forests with rapid industrialization and urbanization, intensive agriculture, over-explotation, overgrazing, mining and other human activities have resulted in the degradation of both the land and water resources. Environmental disaster is a key threat to socio-economic development (especially in developing countries). This book is the compilation of esteemed articles of internationally acknowledged experts in the field of aquatic biology with the intention of providing a sufficient depth of the subject to satisfy the needs at a level which will be comprehensive and interesting. The present book will be useful to the student, research scholars, scientists in the field of Environmental management and ecoplanners, politicians and other people with similar interest.'