FORTIETH BIENNIAL REPORT 61 



SOULE, Scott M. 



Poisoning Shaver Lake, Fresno County, California. Report No. 1. Investiga- 

 tion as to Conditions Necessary and Feasibility. Submitted April 22, 1947. ii plus 

 19 pp., incl. 1 fig. and 3 tables. 



Abstract: Gives general description of Shaver Lake, including brief sum- 

 mary of Southern California Edison Company hydro-electric development on San 

 Joaquin River. Mentions possibilities of controlling poisoned water with outlet 

 diversion closed and with outlet diversion flowing (depending on dilution to pre- 

 vent fish loss below). Lists conditions necessary for poisoning. Discusses feasi- 

 bility and concludes poisoning is feasible only if Edison Company will make a 

 special effort to control the lake to provide conditions necessary for the poisoning. 



An Analysis of Trout Scales From Conn Valley Reservoir, Napa County, 

 1947. Submitted April 25, 1948. 14 pp. 



Abstract: Scales from 99 of the 2,980 rainbow trout checked at the reservoir 

 May 1-4, 1947, were analyzed on the basis of scale pattern, circuli count to first 

 check or break, and scale and fish measurements. It was concluded that 30 of the 

 99 RT consisted of hatchery fish from the initial plant of 100,000 RT fingerlings 

 April 1946 ; and that between 625 and 1,192 of the 2,980 fish checked were from this 

 plant. 



VESTAL, Elden H. 



A New Transplant of the Piute Trout (Salmo clarkii seleniris) From Silver 

 King Creek, Alpine County, California. Submitted September 15, 1946. 11 pp., 1 

 fig., appendix. 



Abstract: Survey of the North Fork of Cottonwood Creek, in southeastern 

 Mono County, revealed its possibilities for a new and remote sanctuary for the 

 Piute trout, whose numbers have recently been reduced in its native Pish Valley, 

 Alpine County, by poaching. During separate trips into Upper Fish "Valley, Piute 

 trout for a transplant were located and captured; and on August 23, 1946, 403 

 fish of all sizes (IJ to 10 inches) were planted in a selected section of the North 

 Fork of Cottonwood Creek. Recommendations for management of the sanctuary 

 are given. In an appendix several recommendations are given for the manage- 

 ment of Upper Fish Valley. 



Report on Fertilization Test With Lower Virginia and Trumbull Lakes, 

 Mono County, California. Submitted November 25, 1946. 11 pp., 4 tables. 



Abstract: Lower Virginia Lake, of 12.3 acres located nine miles west of Con- 

 way Summit, California, at an elevation of 9,250 feet, was fertilized at the start of 

 the growing season with 1,700 pounds of an 8-8-4 commercial fertilizer along with 

 6.41 liters of liquid trace elements. Trumbull Lake with similar characteristics 

 and located 0.4 miles away, was not fertilized and was used for comparison in the 

 fertilization test. At the end of the growing season there had been a greater growth 

 and increase in plant life and plankton (by 26 times in volume of catch) in the 

 fertilized lake. 



Creel returns from Crowley Lake, Mono County, California, 1946. Sub- 

 mitted March 1, 1947. 7 pp., 1 fig., 2 tables. 



Abstract: A creel count was made at Crowley Lake, which has a surface 

 area of 5,284 acres and a maximum depth of 114 feet, by the Bureau of Patrol. 

 During a season of 75 days, 13,181 anglers caught a total of 21,905 fish. Twenty 

 thousand nine hundred eight (95.5 percent) were rainbow; 859 (3.9 percent) were 

 brown trout, and 138 (0.6 percent) were Tahoe cutthroat. The total recorded catch 

 weighed 33,242 pounds, indicating a yield of about 6.2 pounds per surface acre. 

 The average catch per angler per hour for the season was 0.26. Recorded catch is 

 estimated at little more than 50 percent of total. 



Creel Returns From Crowley Lake, Mono County, California, 1947. Sub- 

 mitted September 1, 1947. 6 pp., 2 tables. 



Abstract: A creel count at Crowley Lake was conducted by the Bureau of 

 Patrol during the periods May 1-7 and July 2-7, 1947. During the 13 days of cen- 

 sus 3,364 anglers fished 22,089 hours and caught 4,376 fish, including 4,143 rain- 

 bow (94.4 percent), 203 brown trout (4.6 percent), and 30 Tahoe cutthroat (less 

 than 1 percent). Over a similar period of 13 days in 1946, 3,832 anglers fished 

 23,981 hours and caught 7,943 fish, including 7,495 rainbow (94.3 percent), 382 

 brown trout (4.8 percent), and 66 Tahoe cutthroat (less than 1 percent). Several 

 recommendations are given for changes in fisheries management at Crowley Lake. 



Report on the Creel Census at Rush Creek Test Stream, IMono County, 

 California, 1947. Submitted November 15, 1947. 16 pp., 4 tables, 2 figs., 4 pis. 



(8 photos). 



Abstract: Rush Creek Test Stream, 3.7 miles long, tributary to Mono Lake, 

 was opened for creel survival studies on summer and late fall-planted catchable 

 trout on May 1, 1947. Pre-census fish present in the stream were brown, rainbow, 

 and eastern brook trout ; no browns were planted after 1941 and the eastern brook 

 have not been planted. From May 13 to August 4 five spaced summer test plantmgs 

 were made in the stream of 2,000 catchable (average seven inches) rambow trout 

 each, all marked LV ; on September 22d, the first winter carryover plant of 4,000 

 rainbow trout (average four and one-half inches) was made. Fish were of two 

 groups, 2,000 each, from 1946-1947 fall-spawned eggs (marked Rv and AD) and 

 from 1947 spring-spawned eggs (marked LV and AD). During the 1947 season 

 of 184 days, 5.778 anglers fished 19,569 hours for 10,360 marked and unmarked 

 trout. Marked 1947 planted fish contributed 87 percent of the catch. Out of the 



