CONTENTS 



Page 



Introduction 1 



Source of material . ^ 1 



Analytical procedures 2 



Statistical area system 2 



Size classes of vessels 2 



Standardization of catch per effort. . 2 



Distribution of fishing effort and skipjack tuna catches. 4 



Distribution of quarterly skipjack tuna catches, by regions 4 



First quarter 4 



Second quarter 5 



Third quarter 7 



Fourth quarter 7 



Apparent abundance of skipjack tuna 8 



Geographical trend, by regions 8 



Quarterly trend, by regions 9 



Acknowledgments 12 



Literature cited 12 



Appendix tables 13 



FIGURES 



Page 



1. Fisheries Chart No. 2 of the Hawaii Division of Fish and Game showing 



the statistical areas established for Hawaiian waters 3 



2. The locations of fishing regions established for this study 6 



3. Distribution of skipjack tuna catches (top) and catch per standard effec- 

 tive trip (bottom) averaged over an 18-year period, by regions, first 

 quarter, 1948-65 8 



4. Distribution of skipjack tuna catches (top) and catch per standard effec- 

 tive trip (bottom) averaged over an 18-year period, by regions, second 

 quarter, 1948-65 . 9 



5. Distribution of skipjack tuna catches (top) and catch per standard effec- 

 tive trip (bottom) averaged over an 18-year period, by regions, third 

 quarter, 1948-65 10 



6. Distribution of skipjack tuna catches (top) and catch per standard effec- 

 tive trip (bottom) averaged over an 18-year period, by regions, fourth 

 quarter, 1948-65 11 



