FORTY-SECOND BIENNIAL REPORT 185 



percent "wild" trout. Tims, although twice as many rainbow trout were planted 

 in the spring of 1949 as compared with the previous spring, the return to the angler 

 of hatchery rainbow trout was considerably less than the year before. A detailed 

 record of the 1949 rainbow trout catch is given and factors influencing the catch 

 are discussed and compared with surveys made in 1947 and 1948. 



Pelgen, David E. 



Folsom Reservoir project fisheries improvement devices. Submitted July 31, 1950. 

 10 p., including 5 figures and 2 tables. 



Abstract : An assessment of the value and possibility of the construction of 

 fishery improvement devices such as brush shelters and a subimpoundment to Folsom 

 Reservoir, which is under construction at this time. 



Soule, Scott M. 



Power development of Kings River drainage, Fresno County, California. Report 

 number 3 : Junction development of the Kings River and its Middle and South 

 Forks. Submitted March 31, 1951. vi plus 25 p., including 1 table, plus 3 figures. 



Abstract : Gives brief resume 1 of proposed power development for Kings River 

 drainage, describes Kings River and Middle and South Forks and excellent trout 

 fishery of these waters, illustrates present recreational use by the 180,000 man-days 

 use in 1950 at Cedar Grove area alone. Describes power development plans of City 

 of Los Angeles, U. S. Bureau of Reclamation and F. N. Dlouhy. Discusses potential 

 damage to recreational use of area — from 60 to 40 miles of stream plus important 

 staging areas for recreational use are threatened. Concludes that the question 

 whether or not power development should be permitted, should be decided by public 

 airing ; and that if permitted, the fishery should be protected by minimum pools in 

 reservoirs to be 1/10 maximum area of reservoir and stream releases to be mean 

 minimum flows, and that roads and trails to permit recreational accessibility be 

 replaced if damaged. Recommends action by Division of Fish and Game on above 

 conclusions to safeguard fishery and recreational use. 

 Vestal, Elden H. 



A new chemical treatment apparatus. Submitted November 20, 1950. 12 p., includ- 

 ing 8 figures. 



Abstract : A new chemical treatment apparatus designed by the writer is de- 

 scribed and figured. Apparatus consists of a tube, equipped with a V-hopper at the 

 intake end and two air-cooled outboard motors mounted in tandem near the outlet 

 end. The tube is suspended just beneath the water surface between pairs of plywood 

 assault boats, pinned stern to stern at transom corners. A crew of 3 men is required 

 for operation and the apparatus simultaneously mixes and distributes rotenone 

 powder at an average rate of 50 pounds or more per minute. Estimated total cost 

 is $223.28. 

 Vestal, Elden H., and Robert R. Ehlers 



Improvement of debris jam at Gilman Lake, Mono County, California. Submitted 

 November 6, 1950. 4 p., plus 2 figures and 3 photos. 



Abstract : A debris jam completely blocking the outlet stream of 16-acre Gilman 

 Lake, Mono County, was improved with 75 pounds of high explosive. Technique is 

 described. The only suitable spawning areas for the lake were located in the stream 

 for 500 yards below the jam. 



Improvement of the inlet barrier at Cabin Lake, Madera County, California. Sub- 

 mitted November 9, 1950. 3 p., plus 2 figures. 



Abstract : A rock ledge, 4A feet high and 25 feet long, preventing access to spawn- 

 ing areas above the inlet by trout in 6-acre Cabin Lake, tributary to Shadow Creek, 

 Madera County, was improved by bulldozing with 80 pounds of high explosive. 

 Utilization of spawning areas now available in 350 yards of stream above the lake 

 will obviate any further planting. 



Wales, J. H. 



Second report on the effect of the Klamath River water fluctuation upon the 

 salmonid fishes. Submitted October 19, 1950. 4 p., 2 tables. 



Abstract : Prior to 1950 it was assumed that young salmonids were stranded in 

 the section from Copco dam to a point 75 miles downstream. This assumption was 

 strengthened by finding stranded steelhead fingerlings 96 miles below Copco. Two 

 Fish and Game seasonal aids measured the exposed river bed in the 74-mile section 

 at 1,064 points and computed that the average width on each side of the river was 

 10.1 feet. The number of "harmful" water drops made in a year was computed 

 according to set specifications. Tables 1 and 2 set forth all pertinent data correlated 

 with the above measurements. 



