(3) Handling of the catchy 



After capture, the viscera were removed and the fish were washedo 

 The washed fish were immediately vsrapped in paper, covered with crushed 

 ice 5 and stored in a refrigerator » Due to mechanical trouble, the 

 refrigerator cculd not be operated during this trlpo Although sufficient 

 care was taken in icingj the fish deteriorated to a certain extent due 

 to the length cf time which elapsed before returning to Palau„ 



(4) The peculiar phenomena of the catch ratio and water temperat'ore 

 (at the 100-meter layer) 



The catch ratios ranged from, a minimum of IcO to a maximum of I4.0O0 

 The second^ thirdj, fourthj and fifth fishing grounds showed catch 

 ratios of 10,0 and overo An interesting phenomenon is presented when 

 these catch ratios a^e considered in connection with the water tempera- 

 tures of the 100-meter layere 



As seen in the above tables^ fishing grounds having catch ratios of 

 lOoO or more^ all showed water tenperatures higher than 24 degrees at the 

 100-meter layer ^ 5fe can deduce therefore, that yellowfin prefer a water 

 temperature of over 24.o0 degrees to that of less than 24o0 degrees^ 



