82 FISH AND GAME COMMISSION 



Rush Creeh Test i^irenm. Mono Count i/. Oi^oration of this project was continued 

 through the hiennium. Results denioiistrate a high survival (SO percent or 

 more) to the creel from in-season plants of catchable rainbow and a low survival 

 (less than 10 percent) from fall plants of rainbow fingerlings. 



Fock Creek Stream Use Census, Mono and Inyo Comities. A stream-use survey 

 and creel check was carried out on portions of Rock Creek throughout the 

 fishing season of 1948. in order to obtain facts to support a protest by the 

 Division of Fish and Game against the diversion of Rock Creek above Tom's 

 Place. Information obtained indicated a total stream use of 29,548 angler days 

 and an average use of 2.3.4 anglers per day for each mile of stream. 



Owens River Development Project, Mono and Ini/o Counties. Investigations into 

 the possibilities for further fishery development of the Owens River were begun 

 in May, 1949. and have been continued through the biennium. Findings to date 

 indicate that this 150-mile long stream could receive much heavier utilization. 



Colorado River Program. Preliminary meetings with representatives from Ari- 

 zona were held during the latter part of the biennium and resulted in the 

 establishment of a joint fisheries study program in .lune, 1950, with one man 

 from each state assigned to the program. 



^^alton »S'e«, Imperial County. An investigation of the commercial mullet fishery 

 was continued through the biennium. A program for the introduction of game 

 fish and the necessary forage fish to support them was outlined and eifectuated, 

 with three introductions of forage fish and an introduction of game fish from 

 Mexican waters ; the latter was made jointly with the Bureau of Marine 

 Fisheries. 



STATE-WIDE ANGLING SURVEYS 



A very intensive double survey of 1948 angling was made. It con- 

 sisted of the usual postal card survey and an additional personal inter- 

 view survey. Results showed conclusively that iionresponse to postal card 

 questionnaires in the routine annual postal card survey was not a source 

 of major error, which placed these surveys on a much firmer foundation. 

 A restricted postal card survey of 1949 angling was made to maintain 

 continuity in state-wide catch and angling trends. Results of these two 

 surveys have been published in California Fish and Game. 



CREEL CENSUSES 



Creel censuses are a common method of finding out the results being 

 obtained by stocking, of measuring the trends in the quality of angling 

 in a given water, and of obtaining' similar information useful in laying 

 out management policies. During the biennium, principal creel censuses 

 were carried out on the following waters : 



Name of water County Name of ivater County 



Klamath River Siskiyou County Conn Valley Reservoir Napa County 



Shasta River Siskiyou County Millerton Lake 



Shasta Lake Shasta County Fresno and Madera Counties 



Lake Almanor Plumas County Rock Creek Inyo and Mono Counties 



Truckee River Nevada County Crowley Lake Mono County 



Upper Truckee River_El Dorado County Tapper Rush Creek Mono County 



Donner Lake Nevada County Hume Lake Fresno County 



Bowman Lake Area Nevada County Sequoia Lake Fresno County 



Lake Pillsbury Lake County 



