20 FISH AND GAME COMMISSION 



Joseph H. Wales, Biological Surveyor. 



1. Progress Report of Trout Hatchery Experiments, 1940. April 7, 1941. 15 pp. 



2. Summary of Weekly Disease Reports for 1940. April 9, 1941. 11 pp. 



3. Observations on a Klamath River Fish Screen, May 19, 1941. 2 pp. 



4. Canadian Creek (Trinity River) Diversion Dam. May 30, 1941. 2 pp. 



5. Progress Report of Trout Hatchery Experiments, 1941. Nov. 1941. 12 pp. plus 

 graphs. 



6. Development of Steelhead Trout Eggs, Cal. Fish & Game, Vol. 27, No. 4, pp. 250- 

 260. 3 plates. 



7. Carp Control Work in Lake Almanor, 1941. Cal. Fish & Game, Vol. 28, No. 1, pp. 

 28-33. 3 figs. 



8. Castle Lake Report for 1941. Feb. 1942. 40 pp. 24 figs. 



9. Mt. Shasta Rainbow Egg Selection. Mar. 27, 1942. 



10. Progress Report of the 1941 Squaw Creek Creel Census. Mimeographed by U. S. 

 Forest Service, May 15, 1942. 15 pp. 1 map. 



11. Summary of Weekly Disease Reports for 1941. .June, 1942. 10 pp. 



12. Shasta River Irrigation Ditch Fish Screen Report. June, 1942. 8 pp. 1 sketch. 



13. The Xon-Migratory Rainbow Problem. Feb. 19, 1941. 7 pp. 



Elden H. Vestal, Junior Aquatic Biologist. 



1. Treatment with Rotenone of Pond Systems and Water Supplies at Hot Creek 

 State Hatchery for Control of Ichthyopthirius, Parts I and II. Reports prepared 

 with R. C. Lewis, Hatchery Foreman. 



2. Rough Fish Control in Gull Lake, Mono County, California. Cal. Fish & Game, 

 Vol. 28, No. 1, pp. 34-61, April, 1942. 



3. Report on the Gull Lake Fisheries Project for 1941. May, 1942. 



4. Preliminary Report on Proposed Improvement of Silver Lake, Mono County, 

 Fishery. June 23, 1942. 



5. Reclamation with Rotenone of Crvstal Lake, Los Angeles County, California. 

 Cal. Fish & Game, Vol. 28, No. 3, pp. 136-142. July 1942. 



6. Creel Returns and Trout Production in June Lake, Mono Countv, California, 

 1939-1941. 1942. 



Chester Woodhull, Junior Aquatic Biologist. 



1. A Report on the Kern River Small Mouthed Bass, Nov. 15, 1941. 



2. Supplementary Report No. 1 to a Report on the Kern River Small Mouthed 

 Bass. Nov. 21, 1941. 



3. The Inland Mullet Fishery of California, Preliminary Report No. 1. May 13, 1942. 



A. J. Caxhoun, Student Biologist. 

 1. The Biology of the Black Spotted Trout in Two Sierra Lakes, July, 1942. 



G.\KTH MuBPHY, Student Biologist. 



1. Relationships of the Freshwater Mussel to Trout in the Truckee River, Cal. Fish 

 & Game, Vol. 28, No. 2, pp. 89-102. April 1942. 



One of the most interesting new methods in fishery management is 

 the use of the organic poison, rotenone, for the removal of undesirable 

 fishes from lakes and streams.^ During the biennium the biological staff 

 has made extended use of this material with success. Although detailed 

 reports have been published in California Fish and Game, a brief sum- 

 mary of all of the work of this sort done so far is given herewith. 



Rough fi.sh, such as carp, goldfish and minnows often live together 

 with trout without causing trouble. However, in some cases the balance 

 is upset, and they become so numerous in a body of water that practically 

 no trout remain. The only remedy then is to remove all fish and start 

 again. One of the most effective agents for such an operation is rotenone, 

 a poisonous constituent of derris, timbo, cube and other insecticide 



1 Pioneer work in the application of rotenone to the control of rough fish was done 

 at the Michiean Institute for Fisheries Research. See Leonard, Justin W., Notes on 

 the Use of Derris as a Fish Poison, Transactions of the American Fisheries Society, 

 Vol. 68, pp. 269-280, 1939. 



