This report is presented to aid directly the administrators of the Division of Fish and Game in their conservation program. Herein is given an account of the California halibut fishery and a detailed analysis of the catch in the Los Angeles Harbor district by means of the catch per unit of effort expended. The paper is so arranged that the general and fundamental aspects of the fishery and the results of a catch analysis are briefly given in the first part. For those who may be interested in the details of the fishery some of its life history and methods of boat catch analysis employed, the balance of the paper will be of importance.

Fluctuations in the available supply of striped bass in the San Francisco Bay and Sacramento-San Joaquin river regions for the years 1920–1927 were shown in a bulletin (by Craig, 1930) published by the California Division of Fish and Game. The present report is a continuation of that study of the striped bass, which covers the period January 1, 1928 to August 14, 1931.

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.