184 DEPARTMENT OP PISH AND GAME 



Abstract: Spawning kokanee and their nests were observed periodically from 

 November, 1949 to February, 1950. Drawdown of lake by power and irrigation 

 companies exposed nests. Most of eggs were killed by prolonged freezing. Some 

 eggs which were frozen for only short periods continued development as did eggs 

 in seepage areas. It appears successful natural reproduction of kokanee in Donner 

 Lake is possible, providing water levels can be manipulated reasonably. Discussion 

 of possible remedies, including moving gravels into deeper water. 



Upper Truckee River creel census (El Dorado County), July 1, 1950. Submitted 

 June 27, 1952. 8 p., including 4 tables. 



Abstract : The 1950 creel census was the seventh in a series started in 1939. 

 The average catch per angler was lower than usual (.94 fish per angler) as was 

 the average catch per angler hour (.5 fish). This was due primarily to the high water 

 and it is believed by the author more amateurs were fishing than usual because of 

 the excellent weather. The section from the bridge above Meyers through the camp- 

 ground at the Luther Pass bridge was censused for the first time since 1943 and 

 produced mostly eastern brook trout at a rate of 2.4 per angler and 1.4 per angler 

 hour. Many rainbow spawners were still in the stream but few were taken. 



Loeber, Thomas S. (Student Biologist) 



A report of an investigation of the temperature and salinity relationships of 

 striped bass and salmon in connection with the Reber Plan. Submitted July 2, 1951. 

 16 p., plus 25 tables and 2 figures. 



Abstract : Experiments were carried on at Steinhart Aquarium to evaluate the 

 tolerance of juvenile striped bass and salmon to changes in temperature and salinity. 

 The upper maximum temperature tolerated by fingerling striped bass was approx- 

 imately 95 degrees, in salt water. Similar tests in fresh water failed because of 

 the inability to hold these fish in the aquarium supply of fresh water at any tempera- 

 ture. Fingerling and yearling bass were readily transferable from fresh to salt water 

 direct, usually without any mortality. The change from salt to fresh water, even 

 when made gradually, led to loss of appetite and heavy mortality, on the order of 

 75 percent. A condition of shock commonly followed this latter type of transfer. 

 Experiments with salmon were hampered by disease. Small king salmon were readily 

 changed over with 100 percent survival from fresh to salt water by keeping them 

 for a few days in water of about 50 percent salinity. 

 Meacham, Charles H. (Student Biologist) 



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

 number 4: Headwater storage possibilities on the North Fork, Kings River. Sub- 

 mitted July 20, 1951. 24 p., including 9 tables and 3 figures. 



Abstract : Gives brief description of drainage, briefly discusses proposed water 

 development, lists data examined, encompasses four drainage basins with a total 

 of 24 lakes. Each basin handled as a unit, hydrographic information bulk of report. 

 13,774 acre-feet of water made available by installation of drain pipes and dam 

 construction, provides flow of 231 c.f.s. for 30 days or 58 c.f.s. for 120 days. Fish 

 management information included. 



Murphy, Garth I. 



An analysis of the operation of Sweasey Dam fish ladder, Mad River, Humboldt 

 County. Submitted May 9, 1951. 8 p., plus 3 appendices including 18 figures and 5 

 tables. 



Abstract : This report details the flow records and fish counts over the past 5 

 years. The material is arranged in the form of an operational analysis. All im- 

 portant water stages are illustrated with photographs. The ladder was found to be 

 satisfactory until the spring of 1951, at which time a large sand bar above the dam, 

 which had formed the preceding winter, deflected water into the low water entrance 

 so that fish could not enter it at flows above 1.5 feet (as opposed to 2.2 feet before 

 the sand bar formed). 



Murphy, Garth I., and Herbert E. Pintler. 



The 1949 fishery of Conn Valley Reservoir, Napa County. Submitted July 12, 1950. 

 9 p., including 6 tables. 



Abstract : Conn Valley Reservoir, an artificial lake created in 1945, has a depth 

 of 110 feet, a surface area of 790 acres and a volume of 31,000 acre-feet when full. 

 Although rainbow trout and green sunfish continue to constitute the only "game" 

 fish present, limnological data indicate that ecological conditions are barely tolerable 

 for rainbow trout in summer and early fall. The rainbow trout catch per unit of 

 effort in 1949 was practically identical with 1948, but was composed of about 33 



