22 FISH AND GAME COMMISSION 



sources. The operations were carried out in October and November, 1941, 

 using cube as the rotenone source. x\ll fish were thought to have been 

 destroyed in System No. 2 and all but two in System No. 1, but the later 

 reappearance of more fish indicates that some must have survived in a 

 manner unknown. However, the fact remains that Hot Creek Hatchery 

 went through the 1942 season with no epidemic of Ichthyopthiriasis. 



Crystal Lake, Los Angeles County. This 10-acre lake at an elevation 

 of 5,500 feet in Crystal Lake Park in the Angeles National Forest had 

 become so overrun with chubs and goldfish that trout had practically dis- 

 appeared therefrom. At the request of the Los Angeles County Depart- 

 ment of Forester and Fire "Warden, and with the active cooperation of 

 this agency, the lake was treated with cube on November 5, 1941. An esti- 

 mated 250,000 chubs and goldfish were eliminated, and only 48 trout were 

 seen. The lake was restocked with 14,000 six-inch rainbow in January, 

 1942, of which 7,000 by actual count were caught out in the first 15 days 

 of the 1942 season. Further plants have been made as the season 

 advanced, mth an indicated yield to the angler of 66 per cent of the 

 trout stocked. 



Among the major projects which the biologists now have underway 

 but for which final reports have not been prepared are the following : 



1. A program for the annual study of barren waters in Fresno 

 Count5^ Under the supervision of W. A. Dill in cooperation with the 

 Fresno Sportsmen's Club. 



2. A study of the sport and commercial fishery in the Colorado River 

 and Salton Sea area by W. A. Dill and Chester Woodhull. 



3. A continuance of the creel counts on the South Fork of the Tule 

 River, by "W. A. Dill. 



4. Small mouthed bass studies by Chester Woodhull. 



5. The Waddell and Scott Creek studies on the life histories and 

 propagation of steelhead trout and silver salmon by Leo Shapovalov. 

 Report in preparation. 



6. The Castle Lake project for the study of the comparative product- 

 iveness of planting with rainbow. Loch Leven and eastern brook trout, 

 by J. H. Wales. 



7. Experimental hatchery work at Mt. Shasta Hatchery for the 

 study and prevention of fish diseases and the utilization of various types 

 of fish food. The work is being done by J. H. Wales and assistants. 



8. Studies of the fish production in June and Gull Lakes, Mono 

 County, by E. H. Vestal. 



During the biennium a WPA project was in operation at the Stanford 

 University laboratory of the California Division of Fish and Game, and 

 also rendered field assistance at the Waddell Creek Experimental Station 

 and the Scott Creek Egg Collecting Station. Much useful aid was ren- 

 dered in clerical and laboratory assistance of various kinds and in the 

 translation of fisheries papers in other languages. The projects were 

 numbered 50-11861, Mav 24, 1940 to September 15, 1941, and 50-12364, 

 October 20, 1941 to July 20, 1942. 



A statistical report of the number and sizes of fish reared, rescued 

 and planted during the years 1940 and 1941 will be found at the end of 

 this volume. 



