The book is a systematic clinical / Laboratory diagnostic manual for most of the bacterial and parasitic fish diseases. A brief introductory section on applied anatomy of fishes is offered in this manual . The last section of the manual is a colored atlas of selected fishes' anatomy. The manual is recommended for both undergraduate and graduate students who study Fish Health, Fish Diseases , Fish Bacteriology , Fish Pathology and Fish Anatomy. The book is also very useful for aquatic veterinarians , fish pathologists, fisheries scientists and marine biologists.