(3) In the Hokkai-Sanrilcu Sea Area the skipjack schools are 

 mainly associated vath sharks cr not associatad with an;rt,hing_, 

 and both the number of dense schools and '\±::a index of daiisitv 

 are remarkably high^ but in the Zunaii snd Satsurian sea areas 

 they ai*e oYdeflj bird-associated or sedsnta^r'y schoolsj ar.d spa:-.-. ,3 

 schools are more n'omerous than dense oneso A look at the distri- 

 bution shows that the shark-associated schools occur the farthest 

 north followed by unassociated^ wh3le-a:r3C'GiatGdj bird-(driftv70od") 

 associatedj and sedentary schools in that ordero The results of 

 a certain amount of investigation ci the biting qualities oi 

 schools as well as their density and associations have also been 

 presentedo 



September ±9^ 19 jk 



67 



