FISHERY BULLETIN: VOL. 72, NO. 2 



180' 



CPUE 



1967 1968 1969 

 CPUE □  E2 



NO CATCH o • e 



T>Attu 



^=1 





\6i 



^50' 



I I I I 



4 8 12 

 CPUE 



E-tiiE 



160° 



Longitude 170" East from Greenwich 



180' 



Figure 14. — Distribution and abundance of age .1 sockeye salmon in September 1967, 1968, and 

 1969 as shown by catches of Japanese research vessels. 



Sea; the CPUE averaged about four times higher 

 in the North Pacific than in the Bering Sea 

 (sets with no catch were disregarded). 



Further evidence offish remaining in the North 

 Pacific Ocean is provided by tag recoveries in 

 1964, as reported by Bakkala (1971). His 

 summary of FRI tagging experiments (Figures 

 16 and 17) shows that immature sockeye, mainly 

 age .1 (129) but including 16 age .2 fish, wei-e 

 recaptured in the North Pacific from 1 to 43 days 

 after tagging. Recovery locations indicated that 

 direction of movement from the tagging site was 

 diverse and that recaptures were made to the 

 south, southwest, west, and north. Four immature 

 sockeye salmon were recaptured in the Bering 

 Sea near lat. 60°N, apparent further evidence of 

 movement of some Bristol Bay immatures into the 

 western Bering Sea. 



Because tag recoveries were dependent on the 

 !?.„„„„ ic r. t u * J u J r 1 1 location and effort of the Japanese mothership 



riGURE 15. — Distribution and abundance of age .1 sockeye ^ ^ 



salmon in August 1970 as shown by catches of United Aeet, the degree of movement to certain areas, as 

 States and Japanese research vessels. illustrated in Figure 16, may not have been 



602 



