-242- 



90 - 

 30- 

 70- 



E 60- 

 o 



i_ 501- 



2 40- 

 CC 30 



o 



UJ 



JIGBOAT - BEFORE 1971 



C_ 



— 10- 



-20 



J I I I I L 



-20- 



\r^ 



-3 



I I I I I I I I I I L 



80 - 

 70- 



C5 



z 



liJ 50 



50 

 40 

 30 



02 



04 



06 



08 



1.0 



I 2 



16 



18 



JIGBOAT - AFTER 1971 

 1 0- 



J L 



-20- 



_L 



20 



2 0.4 OS 0.8 1,0 12 1,4 



MULTIPLIER OF EFFORT 



20 



Figure 9. Estimated yield-per-recruit, as functions of age at recruit- 

 ment and fishing mortality vector multiplier, of North Pacific 

 albacore taken before and after 1971 by the North American 

 surface fishery. 



