Fish Pathology by Disease Causation: Bacterial, Fungal, Viral, Parasitic, Neoplastic, Non-Infectious, and Idiopathic Diseases provides the current state of knowledge on important or emerging infectious and non-infectious diseases in farmed finfish. With aquaculture playing a critical role in global food security, there is a growing to accurately identify finfish diseases for early and effective intervention. Because pathology is a visual discipline, this book presents high-resolution color photomicrographs of gross- and histopathological lesions. Written by two internationally recognized experts in the field of fish pathology, this book offers a broad introduction to fish anatomy, physiology, descriptive pathology, and methods for post-mortem examination. Subsequent chapters delve into bacterial, fungal, viral, parasitic, neoplastic, non-infectious, and idiopathic diseases. Sub-chapters systematically examine the cause, pathogenesis, epidemiology, and macro and micro presentations of each disease. The authors advise on diagnosis, effective prevention, and sustainable control of each disease. This book will serve a broad audience seeking a reference to support clinical diagnostics of farmed finfish. It is an indispensable tool for clinical practitioners, field aquaculture personnel, and fish farmers requiring a comprehensive visual reference book in fish pathology.