Page 3 

 ^ LIST OF FIGURES 



Number Page 



1 Map of the upper Big Hole River drainage, showing sample sections 

 where electrof ishing surveys were conducted 11 



2 Example of the transect-grid system used to measure habitat 

 variables 15 



3 Mean, standard deviation and range of total length of Arctic 

 grayling in the Big Hole River, July 7-September 1, 1988 23 



4 Length- frequency distribution of age 1 and older Arctic 

 grayling in the upper Big Hole River drainage in July (A) 



and August (B) 1988 24 



5 Frequency of depth measurements at capture sites of young-of-the- 

 year Arctic grayling 27 



6 Frequency of mean velocity measurements at capture sites of young- 

 of-the-year Arctic grayling 28 



7 Frequency of depth measurements over 0.1 ft in areas near young-of- 

 the-year Arctic grayling capture sites 31 



y 8 Frequency of mean velocity measurements in areas near young-of-the- 



year Arctic grayling capture sites in water over 0.1 ft deep 32 



9 Depth (ft) isopleths for intensive-use area "A" on Swamp Creek 34 



10 Mean velocity (ft/s) isopleths for intensive-use area "A" on Swamp 

 Creek 3 5 



11 Depth (ft) isopleths for intensive-use area "B" on the Big Hole 



River 3 6 



12 Mean velocity (ft/s) isopleths for intensive-use area "B" on the Big 

 Hole River 37 



13 Depth (ft) isopleths for intensive-use area "C" on the Big Hole 



River 38 



14 Mean velocity (ft/s) isopleths for intensive-use area "C" on the Big 

 Hole River 39 



15 Depth (ft) isopleths for intensive-use area "D" on the Big Hole 



River 4 



16 Mean velocity (ft/s) isopleths for intensive-use area "D" on the Big 

 Hole River 41 



