FISHERY BULLETIN: VOL. 72, NO. 2 



60' 



170 E 



lecT 



55' 



50" 



40 



SEPTEMBER-OCTOBER 1964 



^ 



,--*- 



OYASHIO EXTENSION 



AREA 



SUBARCTIC 



CURRENT AREA 



I70*E 



180 



OCTOBER-NOVEMBER 1965 



^V 



ALASK-A^ : ^*^ 



TREAM AREA 

 RIDGE SREA 



OYASh 10 

 EXTENSION 



AREA 



oo 

 oo 



^SUBARCTIC CURRENT AREA 

 TRANSITION AREA 



5 5" 



Figure 18. — Distribution of immature sockeye salmon in the fall in relation to oceanographic 

 features of the Subarctic Region of the North Pacific Ocean (from Bakkala, Figure 48, 1971). 



Figure 19. — Distribution of immature age .2 sockeye salmon in winter (data from 1962-70 with 



the exception of 1964, 1966, and 1968). 



intermingle (long. 170° to 175°E, lat. 46° to 52°N) 

 was estimated to be 5.8% in 1967 and 49.4% 

 in 1968 (Fredin and Worlund^). In spring 1967, 

 cold water (2°C) from the Western Subarctic 

 Domain intruded well east of long. 170°E at lat. 

 47°N, whereas in 1968 the cold water was farther 

 west than in 1967 (French et al., 1971). This 

 change in the environment may have limited the 



westward distribution of Bristol Bay fish and in 

 turn the catch of Bristol Bay sockeye by the 

 Japanese in 1967. 



Tagging data indicate that salmon west of long. 

 170°W in April and May will pass through 

 Aleutian Islands passes west of Adak Island; 

 fish east of long. 170''W will pass through Aleu- 

 tian passes east of long. 175''W. In Figure 22, 



606 



