FORTY-SECOND BIENNIAL REPORT 187 



Creel census, May 3, 1952 — Shasta River, Siskiyou County. Submitted May 5, 

 1952. 5 p., including 2 tables. 



Abstract : An estimated 300 anglers caught 1,815 one- to three-year old steelhead. 

 Average 6.0 per day. Average length of fish 7.3 inches. 



Wales, J. H., and Harry A. Hanson 



The effect on the fishery of the North Fork of the Feather River, California, of 

 proposed hydroelectric developments with special reference to Cresta and Rock 

 Creek projects. (Second revision June 1952). Submitted June 1, 1952. 31 p., includ- 

 ing 4 figures, 3 tables, 2 maps, and copies of 2 other reports on same subject (U. S. 

 Department of the Interior on Fish and Wildlife Resources and report to Federal 

 PoAver Commission on water application by Pacific Gas and Electric Company). 



Abstract : The two projects considered herein directly affect 16 miles of stream. 

 This is a heavily used recreational area. In 1946 the angler days were estimated to. 

 be 36,000 and the trout caught estimated at 10S,000. Eleven commercial resorts and 

 6 Forest Service camps will be affected. The mean river flow in this section was 2,710 

 c.f.s. Recommendations for water releases were recommended for these projects by 

 the authors. A copy of the report to the Federal Power Commission, giving the final 

 release requests, is attached to subject report. 



Wales, J. H. ; E. W. Murphey ; and John Handley. 



Perforated plate fish screens. Submitted October 4, 1950. 13 p., including 7 figures. 



Abstract : The general type of perforated plate fish screen and modifications of 

 this type are described together with a comparison of its value with earlier types of 

 screens. The capacity of perforated plate to pass water and the velocities of different 

 volumes are described. The value of the bypass is emphasized. Possible uses of 

 perforated plate screens are listed. 



Wohlschlag, Donald E. and Chester A. Woodhull 



The determination of fish populations in a medium-sized warm-water reservoir. 

 Submitted April 29, 1952. 77 p., including IS figures. 



Abstract: A report of the fish population study of Salt Springs Valley Reservoir, 

 Calaveras County, California, a pilot study of methods and application as a warm- 

 water fisheries management tool. The report covers detailed discussions of the use 

 of traps and seines for the "mark and recapture" method and application of the 

 Schnabel type of fish population estimate. A method of determining recruitment, 

 mortality and growth rates is discussed. Suggestions for the procedure of future fish 

 population studies in warm-water fish lakes are included. 



Woodhull, Chester 



The white bass Lepibema chrysops (Rafinesque) : Its life history and some fac- 

 tors influencing its possible introduction into California waters. Submitted July 12, 

 1951. 9 p. 



Abstract : Briefly reviews the life history, habitat, and habits of the white bass. 

 Briefly discusses factors of food and possible reduction of striped bass population 

 if planted in the Central Valleys waterways. Planting of white bass in California is 

 not recommended at the present time. 



printed in California state printing office 



70679 11-52 7,500 



