Method of Investigation 



Experimental fishing: was carried out using pole-fishing gear. At the 

 same time oceanographical observations were made on the fishing grounds, 

 and studies were made of the distribution of the schools, the suitability 

 of the fishing gear and methods, and the relationship between sea conditions 

 and fishing conditions. 



Outline of the Progress of the Experiments 



The Zuiho Maru left Palau at 8:Z^0 A.M. on August 26 towing the Hakuo 

 Maru and headed for Yap. The next day at 5:30 P.M. the boats arrived at 

 Yap, and the investigation was begian on the 28th. By September 5 four 

 trials had been run. On September 6 they left Yap and arrived at Palau on 

 the 7th to replenish provisions and drinking water and to land the catch. 

 After taking on supplies they again headed for Yap at 5^00 P.M. on September 

 11, arriving at lOO P.M. on the 13th. The second phase of the investiga- 

 tion was begun on the IZ^th and by September 22 four trials had ^ been made. 

 The 23rd was devoted to preparations for winding up the investigation, and 

 on the 24th the boats left Yap, returning to Palau on the 25th. 



The results of this investigation were as follows; 



Days operated 13 (including the operations of the Hakuo Maru) 



Number of times schools were sighted 16 



Number of times fished 11 



Number of catches made 7 



Number of times fish would not rise to bait k 



Number of fish taken 



Skipjack 1,100 



Tuna 151 



BODY MEASUREMENTS 



*/~"Fatness" or condition factor is found by the formula 10 "H/lJ'.J 



