The branch of science which studies organisms in the seas and oceans is known as marine biology. Classification in this field is done usually on the basis of environment rather than on the taxonomy. The habitats in marine biology are primarily divided into coastal and open ocean habitats. Some of these habitats are seagrass meadows, coral reefs and kelp forests. There are different types of organisms that inhabit the ocean which are broadly classified into microscopic life, vertebrates, plants and algae, fungi and invertebrates. Microbes in the ocean are responsible for most of the photosynthesis which occurs in the ocean. Some of the vertebrates which are studied within this discipline are fish, marine mammals and seabirds. This book brings forth some of the most innovative concepts and elucidates the unexplored aspects of marine biology. It is an upcoming field of science that has undergone rapid development over the past few decades. This book will provide comprehensive knowledge to the readers.