This book addresses infectious diseases of fish and their disorders that arise due to viruses, bacteria and fungi. The book is well written and contains updated information that reflects new developments in the field. This is a must reference/textbook for fish health specialists and veterinarians, microbiologists, zoologists and researchers and students in aquaculture. This book follows fish infectious and focus largely on non- infectious disorder of development, growth and physiology of wild and captive species. The economic implications of non-infectious disorders in intensive aquaculture are of particular importance. Focusing largely on fish, it covers development, growth and physiology of distinct species that includes genetic conditions, respiratory disorders, stress physiology, environmental factors and a new contribution on the relationship between welfare issues and disorders associated with intensive fish culture.