I 100 



1000- 



900 



800 



2 700 



z 



D 

 O 



a. 



600 



IL 



O 



(/) 



Q 



Z 500 



< 



(f) 



D 



o 



I 



I- 400 



300 



200 



400 



1300 



1200 



00 



Figure 9.-~ Production (solid line), abundance Index (long dashes), 

 and fishing-Intensity index (short dashes) for chubs 

 in district K-6, 1929-1953. Seals at left applies 

 only to production; scale at right is in terms of 

 1929-1 9U mean. 



20 



