Table 15. Summary of electrof ishing survey for a 1,000 foot section of 

 Sevenmile Creek (T3N, R12W, Sec. 34A) on August 12 and August 

 21, 1980. 



Species No. Captured Length Range (inches) 



Brook Trout 149 2.1 - 10. 1 



Rainbow Trout ' 2 4.8-7.7 



Rainbow X Cutthroat 1 7.7 



Mottled Sculpin 

 Longnose Sucker 



The standing crop of brook trout in the study section was estimated by 

 using a mark-recapture method (Table 17). The section supported approximately 

 183 brook trout representing a biomass of 13 pounds. Catchable fish (6 inches 

 and larger) composed 30 percent of the populations. Brook trout condition 

 (length to weight ratio) was slightly below average for Mount Haggin streams 

 and other streams in the upper Big Hole River drainage (MDFWP unpublished 

 data). 



Table 17. Estimated standing crop of brook trout in a 1,000 foot section of 

 Sevenmile Creek (T3N, R12W, Sec. 34A) on August 12, 1980. Eighty 

 percent confidence intervals are in parentheses. 



Per 1,000 ft. 

 Species Length Group (inches) Number Pounds 



Brook Trout 3.0-4.9 83 



5.0 - 6.4 68 



6.5 - 10.1 31 



183(+29) 13(+2) 



A 300 foot section of Sevenmile Creek (T3N, R12W, Sec 26) was electro- 

 fished in 1976 (MDFWP unpublished data). Forty-one brook trout ranging in 

 size from 3.3 - 11.5 inches were captured. The fishery potential of Seven- 

 mile Creek was rated as good at the time of the inventory. 



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