120 -1 



100 



80 - 



60 - 



^ 40 



20 - 



1 1 \ \ \ \ \ \ 1 1 



100 200 300 400 500 600 700 800 900 1000 1100 



Weight (g) 



Figure 20. Weight-frequency graph of sauger collected in 

 the spring spawning migration of 1976 in the Tongue River. 



12 -I 



<u S 



H u 



10 - 



4 - 



2 - 



—I — 

 480 



240 



280 



320 



360 



400 440 



Length (mm) 



520 



560 



Figure 21. Comparison of the age and length frequency of 

 sauger taken in the spring spawning migrations of 1976 in the 

 Tongue River. 



49 



