The chum salmon migration was also in the 

 more northerly waters, north of lat. 52° N. 

 in the northern part of the Ridge and Alaskan 

 Stream Areas. 



Catches of chum salmon by Japanese re- 

 search vessels in 1967 and by Japanese and 

 United States vessels in 1968 (fig. 13) indicate 

 that abundance was greater in 1967 than in 

 1968; the 1967 data show that main concen- 

 trations were between lat. 45° N. and 50° N. 

 The largest catches of sockeye salmon were 

 made at the same latitudes, and this indicated 

 extensive intermingling between the two spe- 

 cies in spring 1967. Intermingling was also 

 evident from data in 1968. 



Pink Salmon 



The distribution of pink salmon was similar 

 to that of chum salmon on the three 1968 

 cruise tracks (fig. 14). They were taken only 

 south of lat. 50° N. by gill nets on the two 

 westernmost cruise tracks, but some were taken 

 north of this latitude by longlines. On the 

 eastern cruise track they were taken from about 

 lat. 49° N. to lat. 54° N. Main concentrations 

 of pink salmon appeared to be south of main 

 concentrations of chum and sockeye salmon; 

 this relation was also evident from research 

 cruises in 1967 (fig. 15). Main concentrations 

 were centered near lat. 45° N. in the areas 

 fished. Pink salmon were taken in all water 



Figure 13. — Relative abundance of chum salmon (immatures and maturing) in April 



and May 1967 and 1968. 



15 



