Marine biology is a significant field for understanding lives of organisms inhabiting deep seas and oceans. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of marine biology. The objective of this book is to give a general view of the different areas of fisheries science, marine flora and fauna, marine conservation and technological advancements in marine biology research. It contains contributions of some of the eminent environmentalists, academicians and researchers. The extensive content of this book provides the readers with a thorough understanding of the subject.