As the Science is advancing with the development of new technologies, there is a scope for learning the latest knowledge and in-depth studies of the subject. Therefore regular curriculum revisions are made to meet the learner’s objectives in acquiring the recent knowledge in the subject. Keeping in view of this an attempt is made to write a comprehensive book entitled “Fish Biology, Fisheries and Fish Diseases”. The book contains 11 chapters covering the aspects of Fish biology, aquaculture with emphasis on fish culture, Fish Husbandry, Fish health, Fish diseases and Public health importance (zoonosis) and Diagnosis of fish diseases and treatment. The book is written in a simple and lucid way with several examples and illustrations. This book is highly useful for both under-graduate students of Animal science and Veterinary Medicine as the book is written following the syllabus from harmonized curriculum. I express deep sense of gratitude to all my colleagues of College of Vet. Medicine, for their cooperation and thanks to my wife P. Sarada for her support.