(b) Th9 nost clearly marked current boundaries 

 can be seen in the areas where the zone of 20° » 21° water 

 representing the front of the warm current and the zone of 

 1$^ - 16° water representing the front of the cold current 

 approach each other most closely,. 



(c) The fishermen already kn.ow from experience 

 that the best fishing grc-jnds are found along these current 

 boundaries where the water temperature., salinity j, water color $, 

 and transparency differ o 



(3) l^es and density of skipjack schools and their 

 biting qualities in the Northeastern Sea Area 



ao In this area schools accompanying sharks and unasso- 

 ciated schools occupy the most important place, both 

 in terms of the number of occurrences of schools and 

 in the total number of fish takeno Schools associated 

 with birds, with whales, and with floating logs follow 

 in that order of importance., 



Notes In the Zunan Sea Area schools associated with birds 

 and schools sedentary along shore or on shoals are the most 

 important, followed by unassociated schools « The remainder are 

 a few schools associated with driftwood and with sharkso In 

 the Satsunan Sea Area schools associated with birds arp most 

 numerous followed by sedentary schools and schools associated 

 with driftwoodo A small number of other schools are associated 

 with sharks o 



bo Ihe catch from individual schools is greatest in the 

 case of schools associated with sharks, followed by 

 those associated w1.th driftwood and with whales. The 

 remainder are unassociated schools and schools asso- 

 ciated with birds s in that order, 



Noteo-In the Zman Sea Area bird^^ssociated, sedentary, 

 and uLssociated schools supply the ^^^^ °f,^^/^^^^^; J^ '^^ 

 Satsunan Sea Area, likewise, bird^ssociated and sedentary 

 ^hoo?s Je most important followed by schools accompanying 

 driftwoodo 



r^ l5xceDt for schools associated with birds, with all 



S ty^es of schools there are generally more appear- 

 ^ces ofdense schools than of sparse ones, and their 

 Tensity is higher than that of schools in other sea 

 areas o 



