-271 ■ 



25 



CO 



z 

 o 



f- 



o 



oc. 



»- 



o 

 o 

 o 



X 



o 



— 1 \ 1 r 



SWORDFISH 



m=2.0 

 k = I 



J L 



J L 



II 12 13 14 15 16 17 18 19 20 



10^ HOOKS/ 5° SQUARE 



22 



Figure 7. Relationship of catch of swordfish and effective fishing 

 effort. The equilibrium yield curve (Schaefer production 

 model) is shown for data for 1952 to 1963 only. 



