Synopsis The present text has been designed for the students taking keen interest in marine life. This publication covers Science of Marine Biology; Ocean Water; Resources form the Sea; Sea Floor; Benthic and Pelagic Zones; Nature of Sea Water; Photic Zones; Nekton; Phytoplankton; Zooplankton; Marine Plants; Primary Production in the Sea; Food from the Sea; Coastal Zone; and Intertidal Zone. Efforts have also been made to include the solid basic science content needed in a general education course, including fundamental principles of biology, the physical sciences, and the scientific methods. The general aim was to integrate this basic science content with a stimulating, up-to-date overview of marine biology. We hope this approach demonstrates the relevance of the physical sciences to biology and makes the study of all sciences less intimidating. This publication is useful not only to the students but also to many experienced researchers as an informative references source.