30" 



ISO" 



170° 



160" 



20' 



10' 



10* 



150° 



180° 



PHOENIX 

 IS 



140° 



;'. i . H 



170° 



160° 



AMfflj 'UESAS 



150° 



140° 



130° 



--•. » • .^1 , ,. 



130° 



120° 





1i30° 



20" 



0° 



120° 



Figure 7. Equatorial Longline Fishing Cruises. After 

 finding a rich zone near the Equator south of Hawaii, we fished this 

 area using the Japanese longline method. We have tried to cover a 

 broad expanse of the equatorial region, as can be seen from the 

 above chart. Our plan was to fish across the Equator on selected 

 longitudes at various times of the year and in about another year 

 we will have completed this phase of the program. From our long- 

 line station data, the positions of these stations being indicated by 

 the black dots, we detect quite drastic changes in tuna abundance 

 and we plan to relate these fluctuations to the hydrographic condi- 

 tions and infornnation about the fish food and, finally, attempt to 

 predict the best time and place to fish. 



