Marine biology studies marine organisms, their habitat and physiology. This book studies the fundamental theories and practices related to marine biology. Ecological risk due to pollution and dwindling numbers of aquatic species are causes of concern to marine biologists. Technological advancements in this field have enabled a more concerted effort in understanding the life of aquatic organisms. A number of latest researches have been included in this book on marine biology to keep the readers up-to-date with the global concepts in this area of study. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.