embeddedness, cover, distance to cover, and proximity to both 

 upstream and downstream riffles. The capture sites for fish 

 captured while backpack shocking upstream, backpack shocking 

 downstream, and using grids were treated, in most cases, 

 separately in this report to determine whether capture method had 

 an affect on the capture site parameters. 



Pocket thermometers were used to measure water temperatures 

 at random locations and times of day to the nearest degree 

 Fahrenheit. Streamflows were measured every other week at each 

 of four gauge stations using the type AA current meter. Gauge 

 heights were recorded at least once each week at each location. 

 Staff gauges were located on Swamp Creek at the bridge on the 

 North Fork of the Big Hole Road (section B) , on the west channel 

 of the Big Hole River (on the west bank) approximately 0.3 miles 

 downstream of the Wisdom Bridge (section C) , on the upper portion 

 of the east channel of the Big Hole River about 50 yards upstream 

 of the confluence with Steel Creek (section F) , and on the lower 

 portion of the east channel of the Big Hole River about 0.75 

 miles downstream of the confluence with Steel Creek (section G) . 



To investigate possible competition for food items between 

 brook trout and Arctic grayling stomach samples were collected 

 from 35 brook trout and 12 Arctic grayling using the gastric 

 lavage technique discussed by Light et al. (1983) . These samples 

 were then pooled into the following categories: 1) brook trout 6- 

 10" TL, 2) brook trout >10" TL, 3) Arctic grayling 6-10" TL, and 

 4) Arctic grayling >10" TL. Stomach contents were then sorted 

 into the following classifications with the aid of a dissecting 

 microscope: mayfly, caddisfly, stonefly, scud, aquatic beetle, 

 terrestrial insect, leech, worm, fish, cranefly, and 

 unidentified. Percent composition of the identified matter was 

 calculated for each category (except 'unidentified') by number 

 and volume. 



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