CALIFORNIA (Cont. ) 



3. Mountain Lake Trout Management Study. (FA: F-8-R in part) 



All studies will be conducted in a group of accessible lakes lying between 

 5, 000-7, 000 feet elevation. Marked lots of rainbow, brook and brown trout will 

 be liberated in about ten lakes and the results measured by a partial creel census 

 together with field observations. The first test will compare the success of four 

 strains of rainbow-steelhead in a single lake to select the most suitable strain 

 for planting. Other tests will determine the practicability of eliminating rough 

 fish through trout planting; the comparison of trout fed on different hatchery 

 diets; the comparison of different planting methods; and the comparison of trout 

 reared in warm and cold-water hatcheries. 



Gold Lake Recreation area, Sierra and Plumas Counties; began October 1953, 

 indefinite; $10,000; J. H. Wales, Leader; H. D. Boles, Assistant Leader. 



Address inquiries to: Inland Fisheries Branch, as in No. 1 above. 



4. A Study of the Catfish Fishery of California. (FA: F-2-R) 



The principal objective of this study is to provide adequate information con- 

 cerning fishing pressure and life history data necessary for the sound manage- 

 ment of California's catfish resources. The Sacrannento-San Joaquin Delta and 

 Clear Lake have received concentrated attention. Several thousand white cat- 

 fish have been tagged to furnish data relative to rate of exploitation and migratory 

 tendencies. Samples are collected for study of age and growth, food habits, and 

 reproductive characteristics. Less extensive investigation of other catfish fish- 

 ing areas is planned. 



Statewide; began January 15, 1952, to close June 30, 1957; $15,000; J. B. 

 Kimsey, Leader; reports available. 



Address inquiries to: Inland Fisheries Branch, as in No. 1 above. 



5. Sacramento-San Joaquin River Salmon and Steelhead Study. (Fa: F-7-R) 



This study has three objectives: First, to estimate and evaluate losses in 

 irrigation diversions of seaward nnigrating salnnon and steelhead; second, to 

 study the steelhead and its fishery in the Sacramento River to determine if it 

 is economically feasible to improve steelhead angling in this river system by 

 stocking yearling hatchery fish; and finally, to conduct a long-range quantitative 

 study of the' salmon and steelhead populations of Mill Creek with weir counts 

 of upstream and downstream migrants. Creel census, netting, and the exami- 

 nation of fish at a fish ladder are being done to determine the contribution of 

 planted fish. 



Hdqrs. Los Molinos; began October 1952, indefinite; $40,000; Leo Shapovalov, 

 Leader. 



Address inquiries to: Inland Fisheries Branch, as in No. 1 above. 



6. Selective Breeding of Trout. (FA: F-8-R in part) 



The primary objective is to eliminate the physical abnormalities now so 

 common in the fall-spawning rainbow brood stock of the State. Incidental to this 

 will be the development, through selection, of certain desirable characteristics 

 now absent or poorly developed. 



Mt. Shasta Trout Hatchery; began November 1953, indefinite; $5,000; J. H. 

 Wales, Leader; E. R. Gernnan, Assistant Leader. 



Address inquiries to: Inland Fisheries Branch, as in No. 1 abovo. 



7. Castle Lake Trout Management Study. (FA: F-8-R in part) 



Castle Lake is a fairly typical mountain lake found between 5, 000 and 7, 000 

 feet elevation. A complete creel census which has been conducted for the past 

 13 years is being continued. Since 1951, only rainbow have been liberated, and 

 the success of this species is now being studied. Returns to the angler will be 



