UC San Diego Library – Scripps Digital Collection

This investigation under the authority of the Bureau of Commercial Fisheries, Division of Fish and Game of California, was started in the fall of 1927. The paper, while all on the general subject of Sacramento salmon, is in three parts, each of which is a separate problem. The first part, "Historical and Statistical Review of the Sacramento-San Joaquin Salmon Fishery," takes into consideration the early investigations, history, and statistics of the fishery, artificial propagation, legislation, water supply, prices, and the causes of depletion, with suggested remedies. The second problem, "Survey of Salmon Spawning Grounds in the Sacramento-San Joaquin River Systems," shows the available salmon spawning grounds in the systems as contrasted with the extent of the grounds in the early days. Each stream in the systems is taken up individually to show runs, spawning time and beds, obstructions to the fish, and abundance. The last part is on the "Determination of the Age of Maturity of the Sacramento-San Joaquin Salmon (Oncorhynchus tschawytscha)," and deals with the methods of age determination, the age of maturity, and age classes in relation to sex and types.