JULY- SEPTEMBER 



Figure 5. — Distribution of skipjack tuna catches (top) and catch per standard effective trip 

 (bottom) averaged over an 18-year period, by regions, third quarter, 1948-65. 



trend of apparent abundance showed some strik- 

 ing differences from the trend of average total 

 catches discussed previously. For example, 

 the apparent abundance in the first quarter was 

 highest in offshore west Oahu (2.59 metric tons 

 per trip), whereas the average total catch in 

 the same period was highest off Cape Kaea 

 (fig. 3). Actually, the apparent abundance was 

 nearly twice as high in offshore west Oahu as 



off Cape Kaea (table 3). Apparent abundance in 

 most of the other regions in this quarter was 

 fair and ranged between 1 and 2 metric tons; 

 off Hilo, however, Y/f averaged less than 1 

 metric ton. 



An increase in apparent abundance usually 

 occurred in all regions in the second quarter 

 (table 3). The exception was offshore west 

 Oahu, where Y/f remained at about the same 



10 



