METRIC TONS 



iniLESS THAN 20.00 



^20.01 50.00 



— 100.00 



150.01 



METRIC TONS 



mm]] LESS THAN 1.00 



^m i.oi 2.00 



^2.01 3.00 



JANUARY -MARCH 



Figure 3. — Distribution of skipjack tuna catches (top) and catch per standard effective trip 

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



fishing effort and catch to the temporary ap- 

 pearance of medium-sized tuna (4-7 km.) near 

 Kauai usually about December but occasionally 

 in early January. 



Apparent Abundance of .Skipjack Tuna 



Catches per standard effective trip (Y/f), by 

 quarters of the year and by statistical areas, 

 are given in appendix tables 1-18. 



Geographical trend, by regions . --The appar- 

 ent abundance of skipjack tuna was usually 

 much higher in the regions around Kauai (Na- 

 wiliwili, Makahuena Point, Barking Sands, off- 

 shore Kauai, and Niihau) than in the other re- 

 gions. Actually, it is obvious from table 3 that 

 apparent abundance increases from Hawaii to 

 Kauai County. Shippen (1961), who analyzed the 

 1952-53 catch and effort distribution in the 



