DECLINE OF LAKE TROUT IX LAKE MICHIGAN 



87 



Soo 



M-6 



1930 



1935 



19 40 



19 45 



iOO 



U. 

 O 



10 



a 



X 300 



< 

 in 



:d 

 o 



I 



200 — 



100 — 



o 



3 600 



a 



o 



200 n 



100 



1930 



1935 



1940 



1945 



450 — 



300 ^^ 



ISO — 



200 



CM 

 0> 



(1. 

 O 



o 

 < 



o 

 a: 



100 



1930 



1935 



1945 



Figure 5. — Production, abundance index, and fishing-intensity index for lake trout in districts M-6, M-7, and M-8, 

 1929-49. Solid line= production; long dashes = abundance index; short dashes= fishing-intensity index. Scale at left 

 (thousands of pounds) applies to production only; scale at right is in terms of 1929-43 mean for each item. 



