This is one of ten e Books on the commercial production of ornamental fish. It is based predominantly on the author’s 30 years of experience, mostly onhis own farms. While a few of the e Books are purely commercial, others, particularly those on breeding, will also be helpful to hobbyists, understandable even by beginners. The following description is provided as aguide. All about pathogenic disease, with some golden rules on healthmanagement on fish farms, and descriptions and illustrations of thecausative organisms of many common diseases, with treatments. Includesidentifying signs and symptoms, and common causes of ill health and diseasein fish. Predominantly commercially oriented, but potentially of interest toserious hobbyists.