A fascinating, in-depth exploration of the hidden underwater world, this spectacularly illustrated encyclopedia examines the creatures that inhabit our seas, rivers, lakes, and oceans, revealing the often unexpected and bewilderingly diverse secrets of the deep. Divided into two main sections - aquatic invertebrates and fish - it offers detailed, comprehensive coverage of underwater species including barracudas, piranhas, sharks, octopuses, corals, sponges, jellyfish, and leeches, describing the distribution, habitat, anatomy, behaviour, breeding, and conservation status of groups. Clear, authoritative scholarship from an international team of experts is enhanced by incredible colour photographs and explanatory diagrams. 'Fact file' panels provide key data to aid the reader; locator maps show the distribution of species; and there are feature articles on key topics such as the biological organization of coral reefs, and the lifecycle of the salmon. A list of scientific names, a glossary, and a general index make this encyclopedia accessible and easy to navigate. A unique and invaluable study resource, this is a captivating guide for anyone interested in learning more about aquatic life.