FORTY-FIRST BIENNIAL REPORT 103 



Curtis, Brian 



Report of the Activities of the Biolojiif-al Staff of the Bureau of Fish Con- 

 servation for the Fortieth Biennium, July 1, 11)4(5, to June .'{(), I'.MS. 



Abstract: Describes the activities of the staff. Printed in hirue part in 

 "Fortieth Biennial Report of the Division of Fish ami (lanif" as part of the report 

 of the Bureau of Fish Conservation. 



Douglas, Philip A. 



Rough Fish Control in Elizabeth Lake Canyon Drainage, Los Angeles County. 

 Submitted December 28, 1949. 21 pp., including i:'. figures, »; tables, 1 Kraph, plus 

 Appendix A and 2 sketch maps. 



Abstract: A decline in the fishing success for largemouth black bass, bluegill, 

 crappie, catfish in the Elizabeth Lake Canyon drainage, I>»s Angeles County, 

 necessitated a study of causative factors. 



A heavy population of greaser bliickfish Orthodon microlepidotux (Ayres) 

 was found to be present in the four major bodies of water in the drainage, and 

 stomach analyses indicated that they were of little forage value to the largemouth 

 black bass in the area. 



Plans were laid for a 2-day treatment pro<;ram distribiitini; l.fMMI pounds of 

 cube root-Si percent rotenone, over 1(30 surface acres or ()•">."> acre feet of water, or a 

 concentration of 0.90 p.p.m. of the chemical was used. (A high concentration of 

 rotenone was used due to the alkaline waters involved.) The blackfish was found 

 to be the most susceptible to the chemical, appearing in distress within thirty 

 minutes following application of the rotenone. An estimated kill in waters treati-d 

 was 605,601 rough fish (95 percent) and 26,017 game fish (."> percent i . One lake 

 had a natural kill October 12, 1949, and no new fish appeared following treatment. 



A restocking program for 1950 for the public lakes is base<l on a comparative 

 basis of percentage compositions by species of the original stocking between 19.'18 

 and 1945 of Lake Hughes, and the percentage composition of the same fish jiopu 

 lation estimated following the chemical treatment of November 26, 1949. 



From the above figures the following was noted: Largemouth black ba.ss 

 decreased slightly ; bluegill decreased considerably ; catfish increased moderately ; 

 and black crappie increased considerably. 



A stocking program for the public waters has been proposed for 19.50. 



Evans, Willis A. 



A survey of the city park lakes of Los Angeles in relation to their proposed 

 use for children's fishing recreation, Los Angeles County. Submitted March 2«i. 

 1949. 22 pp., including eight figures and five maps. 



Abstract : A survey of the five Los Angeles City park lakes was made during 

 January, 1949, to determine their adaptability to a children's fishing program. Thn-e 

 out of the five lakes are believed suitable for development and use within the year. 

 The other two may be utilized as brood ponds to serve the other three. Fishinc 

 should be carried on under as natural conditions as possible. I'liysical and biological 

 characteristics of the individual lakes are briefly discussed and rec..mniendntions 

 for fish management in each presented. 



Fraser, J. C. », • i. 



Supplementary Report No. 1 on the Emigrant Basin Flow .Maintenan«-e Dam 

 and Stream Improvement Program (Wildlife Conservation H..:.rd Project .\o. Uii. 

 Tuolumne County. Submitted January (!, 1950. 2:! pp., including three tables. 1 



photograph. 



Abstract: Describes certain subprojects, including 4 new ones, and gives a 

 revised status of subprojects in this program ba.sed on field surveys made in 1919. 



1949 Lake Tahoe Party Boat Catch Records, Placer/El Dorado Counties. 

 Submitted Januan," 9, 1950. 8 pp.. 3 tables. , .., . .  ....n 



\bstr\CT- Seven guide fishermen o|.eiat.Ml from ( alifornia ports in l.M.i. 

 making 357 trips with a total of 587 anglers. Catch consists ofJ.(K.9 n.ack.naw. 



6 rainbow trout, and 5 brown trout, total weight of all trout ."..J:!.".. nnds ; a^erau'e 



weight of all trout 3.4 pounds; average catch per angler 1.. : .ivernge catch per 

 hour .37 ; average catch by weight per angler 5.S pounds. 



