30 DEPARTMENT OF FISH AND GAME 



Lake Wohlford, Sun Diego Count//. A catch record system was devised, records 

 analyzed annually, and management recommendations submitted. 



Big Bear Lake,'San Bernardino County. The values of a warm-water fishery vs. 

 a trout fishery were studied, management recommendations prepared, and a catch 

 record system outlined. 



Los Angeles City Park Lakes, Los Angeles County. Population composition and 

 age-growth studies were carried out and management recommendations sub- 

 mitted. 



Crystal Lake, Los Angeles County. A study was made of trout removal rates. 



Colorado Hirer Studies. Creel checks were operated periodically at strategic points 

 along the river. In addition, at Lake Havasu age and growth, food, and population 

 studies were carried out. The following action was taken regarding the bait minnow 

 problem: decision on acceptable species; preparation of regulations; registration 

 of dealers; periodic inspection of dealers; aid in providing desirable species for 

 propagation, especially golden shiners (Notemigonus crysoleucas) and fathead 

 minnows (Pimephales promelas) . A study of possible forage fish species for intro- 

 duction was also made. Projects of the Bureau of Reclamation were investigated 

 and reports prepared on the Needles-Topock and Cibola Valley areas. 



Salton Sea, Imperial County. The introduction of marine game and forage fishes 

 was continued. Several thousand fishes obtained from the Gulf of California at San 

 Felipe, Mexico, in the course of three trips were planted in the sea. At least one 

 species, a croaker (Bairdiella icistia) , has survived and reproduced in numbers. 

 Tests of tolerances of various fishes to' Saltou Sea water were arranged coopera- 

 tively with the Scripps Institution of Oceanography. 



STATE-WIDE ANGLING SURVEY 



An intensive analysis of state-wide sport catch and angling trends in 

 1951 was made on the basis of a postal card survey carried out in the 

 manner of previous surveys. 



Trout and striped bass angling had not changed appreciably since 

 1949. Catches of black bass and other warm-water fishes declined, pre- 

 sumably because of drought conditions in Southern California. Catfish 

 angling took a slight upward trend. The salmon catch showed a very large 

 increase. 



CREEL CENSUSES 



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

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

 in a given water, and of obtaining similar information of use in fish man- 

 agement. During the biennium. principal creel censuses were carried out 

 on the following waters : 



Name of water County Name of water County 



Klamath River Siskiyou County Salt Springs Valley Reservoir 



Shasta River Siskiyou County Calaveras County 



Shovel Creek Siskiyou County Stevens Creek Reservoir 



Shasta Lake Shasta County Santa Clara County 



Lake Almanor Plumas County Klamath River (mouth) 



Bucks Lake Plumas County Del Norte County 



Truckee River -Nevada County Eel River Humboldt County 



Upper Truckee River Clear Lake Lake County 



El Dorado County Lake Hennessey Napa County 



Donner Lake Nevada County Milliken Reservoir.. __Napa County 



Boca Reservoir Nevada County Sequoia Lake Fresno County 



Silver Fork American River Hume Lake Fresno County 



El Dorado County Millerton Lake 



Lake Merced San Francisco County Fresno and Madera Counties 



