This book forms a complete resource covering ornamental fish health and welfare from a recognized expert on the topic. Beginning with an overview of the tropical fish industry and aquarium keeping, it covers all the key elements of care, including water-quality testing and maintenance, filtration systems, nutrition, husbandry, handling and transportation of fish, disease diagnosis, treatments and medications, and disease prevention. It also reviews areas of wider interest, such as biosecurity and zoonoses. The book can be read through to gain a complete overview of the care and welfare of ornamental aquarium and pond fish, or it can be used to easily look up specific information about a topic of interest. With numerous illustrations and photographs, plus references allowing readers to study areas of interest in more detail, this book makes an invaluable teaching and reference handbook. It is a vital source of information for veterinarians, scientists using fish in their labs, students, ornamental fish breeders, retail pet store workers, and aquarium keepers looking for trusted advice about how to properly care for their ornamental freshwater fish.