1990 Grayling Spawning Report 



LIST OF FIGURES 



Page 



1. Map of the Big Hole River drainage 2 



2. Daily discharge (cfs) and mean, minimum, and maximum 

 water temperatures in the Big Hole River near Wisdom, 

 Montana from May through July 1989 3 



3. Catch of grayling 8.0 inches and longer in the Big Hole 

 River and its tributaries by date during 1989 .... 8 



4. Length frequency of Arctic grayling captured during the 

 1989 spawning run by half inch length group 10 



5. Growth of grayling in the Big Hole River drainage during 

 1988-89 estimated from mean lengths at age . . 11 



6. Depths at grayling spawner capture sites (USED) compared 

 to depths at adjacent unused sites (AVAILABLE) for eleven 

 sites sampled during 1989 16 



7. Both 0.6 and 0.1 depth velocities at grayling spawner 

 capture sites (USED) compared to 0.6 and 0.1 depth 

 velocities at adjacent unused sites (AVAILABLE) for 

 eleven sites sampled during 1989 17 



Page - vii 



