FORTIETH BIENNIAL REPORT 63 



WALES, Joseph H. 



Summary of Activities of the Fish Screen anrl Ladder Crew from Janu- 

 ary 1, to October 1, 1946. Submitted October l.j, 11)4G. 5 pp. 



AbsU-act: A statement of the present status of fish screens in Northern 

 California is given. The difficulties of maintaining screens and the shortcomings 

 of fish screens are outlined. A plan to reduce the number of screens to about 30 

 is proposed. These must be modern and will be freciuently serviced. The present 

 status and future plans for our Northern California fish ladders are outlined. 

 Removal of abandoned dams and natural falls has important place. Projects for 

 1947 are listed. 



Creel Census — May 1, 1947. McCloud River Mouth, Shasta County. Sub- 

 mitted May 31, 1947. 4 pp., 1 table. 



Abstract: On Maj' 1, 1947, a creel census was made at the mouth of the 

 McCloud River (both in river and in Shasta Lake). Eighty-eight shore fishermen 

 were counted and 14 contacted. Average catch per shore fisherman was 4.6 fish or 

 0.9 fish per hour. Average catch for boat fishermen was 1.5 fish or 0.3 fish per hour. 

 These figures indicate a lower catch from the boats than in the two previous 

 years but a larger shore catch. However, the fish caught from shore in 1947 were 

 smaller than in 1945 and 1946. The trout catch for both shore and lake fishermen 

 in 1947 showed no improvement over 1945 and 1946 but there was improvement 

 in a much reduced number of rough fish. No cause can be found for the smaller 

 catch of these squawfish and hardheads. 



Castle Lake Trout Inve.stigation ; 1946 Catch, and Chemical Removal of 

 all Fish. (Siskiyou County.) Submitted June 20, 1947. 21 pp., 14 tables, 1 figure. 



Abstract: In 1946, 667 anglers caught 1,275 fish from Castle Lake (0.48 per 

 hour or 1.9 per angler day). Twenty fishermen caug:ht over 50 percent of all fish 

 and 57 percent of anglers caught nothing. As in previous years the BN constituted 

 over half the catch, RT less than one-fourth and even fewer EB despite nearly 

 equal plants of all. Lake poisoned on October 9, 1946, and all fish possible were 

 recovered and recorded. Numbers were as follows: BN, 2,027; EB, 364 (planted 

 in 1946) ; EB, 50 (planted prior to 1946 ; RT, 44 ; mackinaw, 81 ; black dace, several 

 thousand ; golden shiners, several hundred. Small numbers of RT recovered prob- 

 ably due to fact that they were in deeper water when killed and could not be 

 recovered. Fingerlings planted prior to poisoning then recovered yielded data on 

 mortality during critical period. Mortality of all trout planted in lake during past 

 nine years divided as follows: 90-97 percent due to natural causes, 3 to 10 per- 

 cent caught by anglers. A new method of siphoning cube liquid into deep water is 

 described. 



Creel Censuses in District 1, May 1, 1948 



1. McCloud River, Mouth, 3 pp. 



2. Shasta River, 3 pp. 



3. Klamath River, 5 pp. 



Submitted May 13, 14, and 17, 1948. 



AbstJ'act: 1. Only 28 anglers fished here May 1st, probably due to weather 

 and road conditions. Total catch : Five RT, one BN, one "pike." The average of 

 0.24 fish per hour is far lov.er than in any of the three preceding years. No marked 

 PtT from Almanor Hatchery in catch. 



2. Open May 1st from mouth five miles up for first time in several years. 

 Eighty-six (most of the) anglers checked, known to have caught 260 SH. Catch 

 per hour 1.37 for lower half of section, 0.79 for upper. Size range four inches to 18 

 inches, with 92 percent from five inches to nine inches. 



3. From Fall Creek to Scott River 108 anglers (a fairly complete check) 

 had 135 SH and one probable salmon. 0.50 fish per hour from Shasta River to 

 Fall Creek, 0.39 from Shasta River to Scott River. Size range four inches to 18 

 inches, with 84 percent five inches to nine inches. 



WOODHULL, Chester 



A Preliminary Investigation of the Mokelumne River from Tiger Creek to 

 Pardee Reservoir. Submitted October 8, 1946. 14 pp. plus 1 map, 3 graphs and 

 9 photos. 



Abstract: A summary of the proposed changes of the P. G. & E. hydro 

 system ; and a physical and biological survey of the river. A new plant will be 

 constructed, the Electra Plant is to be enlarged and a tunnel system will replace 

 the Electra canals. Regulating dams 18 to 22 feet high will be built at the plants. 

 The mean flows needed by the plants exceed the mean stream flow. Because of the 

 exposed character and low altitude of the river, a suggested minimum release 

 of water is set at 15 c.f.s., to maintain this fine trout stream. 



Spawning habits of the striped bass (Roccus saxatilis) in California 

 waters. Submitted November 1946. 12 pp., 3 figures. 



Abst7-act: Describes observations of spawning behavior of striped bass; 

 collection of eggs ; and data on location and conditions. 



