The keeping of ornamental fish is the most widespread animal related hobby in the world. Many textbooks and most of the related literature focus on diseases of fish bred for human consumption, especially aquaculture species. This review provides 265 clinical cases, covers all of the important medical and surgical conditions found in ornamental fish and includes material on aquatic invertebrates. The illustrated cases appear randomly by topic and are targeted at different levels of expertise. In addition, questions on fish anatomy, physiology, husbandry and identification are included to ensure that the book is both educational and comprehensive. A team of internationally respected authors have written the questions and detailed explanatory answers to make the text practical, informative and, at the same time, easy to read. Veterinary practitioners, professional aquarists, hobbyists and students will find this a valuable addition to their education and clinical training.