fish are fairly stationary through at least their first summer. 



The Arctic grayling population of the Big Hole River is 

 continuing a decline that threatens their continued viability. 

 More work is needed to understand why this population has 

 declined so drastically. Studies of the distribution, habitat 

 use (throughout the year) , interspecific competition, predation, 

 thermal tolerances, and land and water uses in the Big Hole 

 Valley that affect the grayling are examples of the work required 

 to help managers understand and remedy the factors causing the 

 demise of this unique and threatened fishery. 



