140° 160' 



120° 



140° 



160° 180° 160° 140° 



120° 



100° 



80° 



Figure 20, Known Trans-Pacific Distribution of 

 Yellowfin Tuna, Summarizing all our yellowfin data collected 

 since the start of the POFI equatorial longline fishing and adding 

 other data from various sources, we constructed the above chart. 

 It appears quite certain that abundant yellowfin stocks are to be 

 found continuously across the Pacific from 120° W. to the Asiatic 

 mainland with the greatest concentration in the broad band south 

 of Hawaii between 140° W. and 170° W. No catch records are 

 presently available for the 1,500-mile stretch between 120° W. 

 and the Galapagos. We do not know yet whether the band of tuna 

 is continuous through the area designated as "unexplored" in the 

 above figure. 



21 



