o 

 o 



o 

 o 



o 



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7 

 6 

 5 

 4 

 3 

 2 



JAPANESE COMMERCIAL FISHING 

 (ABOUT 2000 HOOKS / SET ) 



n POP I EXPLORATORY FISHING 

 (300 HOOKS /SET) 



1 



ft-' 



^£= 



^ 



s- 



LATITUDE 



•N. 



Figure 12. Comparison of Catch Rates from Japanese 

 Commercial and POFI Experimenta l Fishing. In the two previous 

 figures we discussed the catch rate from Japanese longline fishing 

 in the western Pacific, Until recently we did not know definitely 

 whether our small-scale experimental fishing was sufficiently like 

 the Japanese full-scale commercial fishing to give the sanae mea- 

 sure of yellowfin concentration. In 1952 we had a chance to make 

 a direct comparison when the JOHN R, MANNING and a Japanese 

 vessel were fishing at nearly the same time in the same place, 

 near the western boundary of our survey area (along 170° W. 

 longitude). Plotting the catch per hundred hooks of each vessel 

 against latitude shows that our gear gives catching rates that are 

 comparable to the Japanese commercial operations. 



This is the first instance of Japanese fishing as far 

 east as our survey area. There is no evidence that they have come 

 as far as the relatively richer area south of Hawaii. 



13 



