20, 



16 



12 



8 



4 



1980 



Marcl 



25 30 5 10 13. 20 25 30 5 10 15 20 

 :h April May 



20 



16 



12, 



8, 



4. 



11 



5 10 15 20 25 30 5 10 15 20 

 Hay 



60 



50. 

 40 



30. 

 20. 

 10 



5 10 15 20 25 30 5 10 15 20 

 April Hay 



Figure A33. 



Sex ratio (males :females ) of sauger collected in 

 the lower Tongue River during spring, 1976-1979. 

 Arrows indicate date that the first ripe or spent 

 females were collected. 



147 



