Canning is the most important factor in the fishery industry today, but information concerning the principles of canning fishery products has not been assembled, nor has a description of modern canning methods been previously available. This report is a reference handbook on problems in the commercial canning of fishery products. In addition to discussing the scientific principles on which canning is based, it outlines the various engineering problems faced by the canner, and gives a detailed description of the methods used today in the commercial canning of 48 varieties of fish and shellfish packed commercially in hermetically sealed containers. Information on spoilage and methods used in the examination of fishery products is of use to the laboratory worker. The discussion on fishery products as food is of benefit to producers, brokers, dealers, food technologists, home economists, consumers, and all others interested in foods and their use.