FRENCH and BAKKALA: NEW MODEL OF OCEAN MIGRATIONS 



■c-^. 



^.V*""' 



APRIL- MAY 



^ 



 J 







'M 





m 



o o 



9p 



•^ s o _ 



o 



o> 



• od 



cS* 



o o 



■'V'-St', _| 





-• 

 o 



o 



60°N 



50° N 



^ 



/: 



^ 



sfl 



o 



.>-^' / 





JUNE 



--$ 



7./;^ 



.4»- 



•* ° 



o • 



o 



8 <^o 



oo . 8 



o 

 o 



cm» o 0($> 



) 



Or 



°*^°°# 



99 oo o<S ^V' ""'V"- r- 



fe . ""-- 



f M' — 



60»N 



.*> 



' o o" 



;» ■" ;^ . 



o 



o 

 o 

 o 





# • cP o 



CPUE 

 o 



• < I 



• 1-5 



• 5-10 



• >I0 



■^ 



'%r. _ 



SCN 



 .'V 



1^ 



lecE i/CE 180' i70"w leo'w iscw i40''w lao-w 



Figure 7. — Distribution of age .1 sockeye salmon in the spring (data from 1956-61 and 1966-70). 



I20°W 



efficient for age .1 salmon as for older age -groups, 

 some age .1 fish were taken, and these catches 

 at least reflected the presence of the immature 

 fish. In April and May (Figure 8) age .1 sock- 

 eye salmon were primarily found south of lat. 

 52° to about 46°N and extended eastward to about 

 140°W. 



Most of the age .1 sockeye salmon caught by 

 FRI during the 3 yr of longline surveys were 

 taken in 1964. These fish in the area of the largest 

 catches (long. 160° to 145°W, south of lat. 52°N) 

 were mainly age 2.1 fish (75%), the age-group 



which predominated among samples taken in the 

 central Aleutian Islands area during the summer 

 and which were likely of Bristol Bay origin, and 

 fish which made up part of the record run of 

 age 2.2 sockeye to Bristol Bay in 1965. Thus it 

 appears that Bristol Bay stocks in April and May 

 could extend eastward in the northeastern Pacific 

 at least as far as long. 145°W. 



By June the age .1 sockeye have started a 

 northward movement along a broad east-west 

 front and in late June have even reached the 

 central portions of the Bering Sea (Figure 7). 



597 



