CONTENTS 



Page 



Introduction 1 



Methods 2 



Interpretation of contours 7 



Bluefin and southern bluefin tunas 10 



Albacore 10 



Bigeye tuna 13 



Yellowfin tuna 13 



Swordfish 16 



White marlin 16 



Blue marlin 16 



Black marlin 16 



Sailfish and spearfish 20 



Skipjack tuna 20 



Literature cited 24 



Figures 



No. Page 



1. Divisions of the Atlantic Ocean 7 



2. Catch per thousand hooks, 1956-68, various tunas and billflshes 



in selected areas (see text) in the Atlantic Ocean 7 



3. Relative amounts of fishing by the Japanese longline fleet in 



the Atlantic Ocean, 1956-68 8 



4. Distribution of catches of bluefin tunas (per 10,000 hooks) in 



the four quarters of the year, 1956-68 11 



5. Distribution of catches of albacore (per 100 hooks) in the four 

 quarters of the year, 1956-68 12 



6. Distribution of catches of bigeye tuna (per 1,000 hooks) in the 



four quarters of the year, 1956-68 14 



7. Distribution of catches of yellowfin tuna (per 100 hooks) in the 



four quarters of the year, 1956-68 15 



8. Distribution of catches of swordfish (per 10,000 hooks) in the 



four quarters of the year, 1956-68 17 



9. Distribution of catches of white marlin (per 1,000 hooks) in the 



four quarters of the year, 1956-68 18 



10. Distribution of catches of blue marlin (per 1,000 hooks) in the 



four quarters of the year, 1956-68 19 



11. Distribution of catches of black marlin (per 10,000 hooks) in 



the four quarters of the year, 1956-68 21 



12. Distribution of catches of sailfish and spearfish (per 1,000 hooks) 



in the four quarters of the year, 1956-68 22 



13. Distribution of catches of skipjack tuna (per 10,000 hooks) 



in the four quarters of the year, 1956-68 23 



iii 



