In the averages for 193U-1935 the Ryukyu stock was 80^ and the 

 Ogasawara stock vias 20^, Accordingly it is thought that the 

 Ryukyu stock plays an important role ::;. the fluctuations of 

 the skipjack catch of the Northeastern Sea Area (table 11), 

 The foregoing represents an attempt to make two or three 

 deductions concerning the age composition, types of schools^ 

 and provenance of the skipjack schools on the Pacific coast 

 of Japan, however j there are still many points which require 

 examination and therefore it is thought that future investi- 

 gations will amplify and correct these hypotheses » 



Table lie Percentage of skipjack schools of each 



stock fished in the Northeastern Sea Area 



*This is the catch to the end of June 1936 



50 



