66 FISH AND GAME COMMISSION 



theorj', so that recent work has attempted to supply a basis for yieki 

 management for both king and silver salmon as follows : 



1. Volume of present runs in each stream. 



2. Contributions of each stream to the ocean catch. 



3. Relation of existing and proposed stream obstructions to spawn- 

 ing areas. 



4. Measurement of escapement at present and desirable for the 

 future, leading toward maximum sustained yield for each stream. 



Striped Bass 



Past work has supplied most of the needed biological knowledge, 

 with three minor exceptions noted below. The problem now is to man- 

 age the fishery so as to maintain the present high recreational value. 

 The investigative program is therefore planned as follows : 



1. Further development of our sport catch records so as to meas- 

 ure changes in abundance. 



2. Basis for regulation to maintain a high population level. 



3. More complete knowledge of 



a. Food habits 



b. Migrations 



c. Spawning areas and intensity 



Oysters 



Unlike most of our other fisheries, the need here is to develop the 

 industry in this State so the program for oysters is the collection of 

 essential biological information to aid in the establishment and main- 

 tenance of beds for the native, eastern and Japanese oysters. The 

 work involves : 



1. Determinations of salinity, temperatures and pH, spat counts 

 and examination of gravid oysters to aid the industry when setting 

 out spat collectors. 



2. Experiments with more efficient methods of spat collection. 



3. Experimentation in establishment of a spa"OT^iing stock of Jap- 

 anese oysters in this State. 



The oyster work has centered at Humboldt Bay, due to the assist- 

 ance rendered by Humboldt County, with some work conducted at 

 Elkhorn Slough and Drakes Estero. 



Marine Sport Catch 



The catch by marine anglers has grown to such magnitude that it 

 must be considered in population studies and management policy. Sev- 

 eral years ago preliminary data were gathered to try out a system of 

 recording this catch and fairly comprehensive figures have been col- 

 lected for the last three years, but the system should be extended and 

 improved and in some instances supplemented by more detailed rec- 

 ords as checks. The present program includes: 



1. Collection and analysis of marine sport catch statistics as a 

 measure of population and fishing intensity. 



