Presents a study of the variables in waste quality as they affect the survival, reproduction, growth, production, or management of fish. An attempt is made to define 'good' water quality. Information is presented which will be of help in: determining the potential of a body of water for fish production, improving water quality, avoiding parasite problems and stress-related fish diseases, maintaining fish for research purposes, and improving fish production. The study is divided into three parts. Part one is concerned with the general aspects of water quality and their relationship to fish production. It treats the questions of temperature, salinity, turbidity and color, plankton, dissolved oxygen, pH, carbon dioxide, ammonia, hydrogen sulfide, total alkalinity and total hardness, aquatic weeds, and pollutants. Part two outlines in simple form several important water quality management techniques. It deals with inorganic and organic fertilizers, liming, the removal of clay turbidity, reduction of pH, dissolving oxygen, fish feeding and water quality, aquatic plant control, and calculations for chemical treatments. The third and final part offers some suggestions regarding water analysis in fish culture and treats sampling water, water analysis kits, and Secchi Disk visibility. The data, which summarizes Boyd's book, Water Quality in Warm-water Fish Ponds, are presented not as definitive, but as informative and suggestive. The question of coldwater fish production is explicitly excepted. Appended are a 75-item bibliography and a glossary of technical terms.