20 40 60 80 100 120 140 

 Discharge (nrysec) 



Trip Catch Rate 

 vs. Discharge 



I I I I I I 



20 40 60 80 100 120 140 



Discharge (mVsec) 



Figure 15. Quadratic regression analysis of discharge versus 

 catch rates of shovelnose sturgeon in the Tongue River in the 

 spring of 1975. 



Linear Catch Rate 

 vs. Discharge 



T 1 1 1 1 — T" 



10 20 30 40 50 60 



Discharge 



■Vsec) 



i; 10 -^ ' 



; 



Trip Catch Rate 

 vs. Discharge 



40 60 80 



Discharge (m'/sec) 



Figure 16. Quadratic regression analysis of discharge versus 

 catch rates of shovelnose sturgeon in the Tongue River in the 

 spring of 1976. 



41 



