10& 

 9Q 



80. 



70 



60' 



5CM 



40 



3a 



20, 



10 



1977 



1978 



1979 



X 



\ 



. ,-J \'- ^, 



5 lb 15 20 25 30 i I'o li 20 25 3D 



April 



May 



Figure 18. Number of Stizostedion sp. eggs collected on 4 transects 

 of the Yellowstone River downstream from Intake diversion, 

 1977-1979. 



48 



