110 FISH AND GAME COMMISSION 



Vestal, Elden H. and Ralph Y. Beck 



Preliminary report on the proposed chemical reclamation of Bridgeport Reser- 

 voir, Mono County, California. Submitted August 23, 19-48. 14 pp., 1 figure. 



Abstract : The Bridgeport Reservoir, of the Walker River Irrigation District, 

 is located near Bridgeport. Mono County. It has a capacity at spill of 42,460 acre- 

 feet with a surface area of 3,070 acres and maximum depth of about 49 feet. The 

 reservoir at one time produced reasonably good trout fishing, but since about 1934 

 has become overrun with carp. Exceptionally dry seasons of 1947-48 have created 

 the first opportunity for carp removal from the reservoir and tributaries in 15 years ; 

 and feasibility for the project is expected by late September or eai-ly October this 

 year. The method of continuous distribution of rotenone at 1 p. p.m. in the tributaries 

 with backpump treatment of nonflowing "pockets" is outlined. Treatment of the 

 reservoir will follow methods used at Gull Lake, with a concentration of rotenone 

 of 1 p. p.m. Fish rescue is not considered practical and it is desired that dead fish 

 be left to refertilize the reservoir. It is recommended that 200,000 brown trout finger- 

 lings be used to restore the sport fishery. 



Report on the stream-use census at Rock Creek, luyo and ]\Iono Counties, 

 California, 1948. Submitted December 17, 1948. 22 pp., 1 figure, 4 tables, 1 graph. 



Abstract : A stream-use census was conducted over chiefly 6.3 miles of Rock 

 Creek during the entire 1948 angling season of 184 days. The project was in support 

 of a protest by the Division of Fish and Game against application of the City of Los 

 Angeles to divert 50 c.f.s. and 40,000 acre-feet from a point 0.9 miles above Tom's 

 Place, Mono County. Special car samples totaling 120 in June, July, and August 

 showed an average of 2.86 persons per car, of which 73.2 percent were anglers. Some 

 14,114 cars were recorded in the project area in 1948 ; the total number of recrea- 

 tional days was estimated at 40,366. indicating an estimated 29,548 angler days in 

 the 6.3 miles during the season. Average daily use per mile per day was about 25.4 

 anglers. Angler use was greatest in July with 9,851 angler days (50.4 per mile per 

 day) and least in October with 2,037 angler days (10.4 per mile per day). Assuming 

 a cost per angler of 20 dollars, the 6. .3 miles of stream were valued at $590,960 in 

 1948 to fishermen. Possible developments for the future in Rock Creek Gorge might 

 provide for 9.347 more angler days. The 1948 creel count showed that 3,963 anglers 

 fished 6,119 hours for a total of 11.956 trout; 9,956 (83.2 percent) were rainbow 

 trout, 2,004 (16.7 percent) were brown trout, and 5 (0.04 percent) were eastern 

 brook. Zero catches totaled 990 (32.5 percent). Average catch per angler per day 

 was 3.0 and average catch per angler per hour was 1.9. 



Vestal, Elden H. and Leon A. Talbott 



Aerial fi.sh-planting in the High Sierra, Season of 1949. Submitted March 7, 

 1950. 16 pp., including 2 tables. 



Abstract : A report of the first large-scale airplane fish planting in the 

 High Sierra Region of California. July 20 to 29, 1949. Includes tabulation and 

 discussion of a series of practical fish-planting tests at Virginia Lakes. ^Nlono County, 

 as well as a detailed list (Table 2) of all plants made. Estimated cost of the planting 

 work is discussed. A summary of the planting is provided on page 11. 



Wales, J. H. 



Some thoughts on trout management. Submitted May 27, 1949. 16 pp., in- 

 cluding 2 figures. 



Abstract : Ideas are expressed regarding : 1. Improvement of environment. 

 2. Reduction of predation. 3. Introduction of new species. 4. Planting of native 

 species. 



Creel census. May 1, 1949, Shasta River, Siskiyou Countv. Submitted May 31, 

 1949. 3 pp., including 2 tables. 



Abstract : Second annual creel census of angling iu a section of Shasta 

 River from highway 99 crossing near Treka downstream. Anglers checked — 36. 

 Catch 140 fish or 3.9 per angler day. All immature steelhead, average length 7.1 

 inches. 



Klamath River fish count, Klamathon Racks. Submitted February 23, 1950. 

 11 pp., including 2 tables and 1 figure. 



Abstract : The racks were placed in the Klamath River on August 15 and 

 removed on November 17, 1949. During this period 11,212 king salmon, 541 silver 

 salmon, and 2,836 steelhead adults were counted through on their spawning migra- 

 tion upstream. This is the first year that a complete count of the silver salmon has 



