FORTY-SECOND BIENNIAL REPORT 183 



Abstract : The 1950 and 1951 catch made by guide-operated fishing boats on 

 Lake Tahoe are presented with a summary of the 1947 to 1949 data for comparison. 

 Five operators reported in 1950 but only 3 reported in 1951, when reports were 

 submitted voluntarily. 



1950 1951 



Average weight lake trout caught 3.5 3.5 



Average catch per angler 1.7 1.3 



Average catch per hour .40 .32 



The annual Truckee River, Nevada County creel census, May 27, 1950. Sub- 

 mitted March 12, 1952. 7 p., including 4 tables. 



Abstract : The annual opening day creel census resulted in 49 anglers being 

 interviewed which was the lowest number for any of the censuses. Eighty-four trout 

 were caught in 136 hours of fishing for an average catch per angler hour of 0.62 

 which is the highest rate of catch since 104.">. Seventy-five percent of the catch 

 were rainbow and 25 percent were brown trout. Nevada residents comprised 59.2 

 percent of the anglers and caught 66.7 percent of the trout recorded. 



German, Eugene R. 



A preliminary report on a new surface sampler. Submitted January 29, 1951. 

 5 p., plus appendix including 6 figures. 



Abstract : Ideas are put forth on methods and equipment to sample the surface 

 of a lake or reservoir. The construction of a sampler is described, and plans for 

 further tests and use discussed. 



German, E. R. and J. H. Wales 



Castle Lake trout investigation 1950 season — second phase : eastern brook trout. 

 Submitted January 29, 1951. 22 p., including 17 tables. 



Abstract : A report of the fourth year of the eastern brook trout phase. 5,255 

 trout taken in 1,358 angler days at an average of 3.9 per day and 1.36 per hour. 

 Most angler days since census started in 1941, but lowest catch per day since start 

 of eastern brook trout phase in 1947. Fish planted as yearlings have yielded 48 

 percent return. First fingerling plant (1947) has yielded 28 percent; indications 

 are that second fingerling plant (194S) will exceed 30 percent return. This is a 

 very high return for fingerling plants. Even though the population was smaller 

 in 1950, the eastern brook trout failed to attain much size. 



Hanson, Harry A. and Robert R. Harry 



Report on experimental fish screen, Rock Creek, Plumas County. Submitted 

 July 17, 1951. 4 p., including 2 figures and 1 table. 



Abstract : The purpose of the screen and trap on Rock Creek was to determine 

 how many rainbow trout fingerlings could be salvaged from the stream as the stream 

 dried up. The fingerlings were natural reproduction in the stream, progeny of a run 

 of rainbow trout that migrates each spring upstream from Lake Almanor. About 

 6,000 were intercepted by the screen between July 27 and August 27, 1950. 



Johnson, William C. 



The reliability of the striped bass party boat catch records. Submitted January 

 9, 1951. 14 p., including 4 tables, 1 figure and 1 exhibit. 



Abstract : Striped bass party boats were observed during the months of August, 

 September, and October 1950, the most important months for striped bass fishing. 

 The number of passengers and the number of striped bass were counted on the 

 individual boats and then these data were compared with the reports submitted 

 by the party boat operators to determine the reliability of reporting. It was found 

 at the completion of the survey that the party boat records that are kept by the 

 permanent operators are reliable, and they are the operators who make up the 

 backbone of the fishery. 



Analysis of 1950 striped bass party boat fishing effort. Submitted May 31, 1951. 

 8 p., plus appendix. 



Abstract : A routine report analyzing the fishing effort of the striped bass party 

 boat operators during 1950. The analysis was made from the daily logs that the 

 operators submitted and personal observations of the party boat fleet fishing. 



Kimsey, J. B. 



Notes on kokanee (Oncorhynchus nerka kennerlyi) spawning in Donner Lake, 

 Nevada County, 1949. Submitted June 30, 1950. 18 p., including 6 figures. 



