500 -I 



400 - 



300 - 



200 - 



100 - 



Moximum 



Minimum 



T 



20 25 30 

 Temperature ("O 



Figure 25. Plot of the quantity of sauger taken per interval 

 of maximum and minimum water temperatures in the spring of 1976 

 in the Tongue River. 



— Minimum 

 Maximum 



Linaor Catch Rota 

 y». Temperoture 



/ \ "■■■ 



laB^c 



10 



15 



20 



10 



15 



Temperature CO 



Temperature (°C) 



Figure 26. Quadratic regression analysis of maximum and 

 minimum water temperature versus catch rates of sauger taken in 

 the spring of 1976 in the Tongue River. 



54 



