Table 30. Summary of electrof ishing survey for a 1,000 foot section of 

 Willow Creek (T4N, RlOW, Sec 31B) on August 5 and August 19, 

 1980. 



Species No. Captured Length Range (inches) 



Brook Trout 494 1.5 - 9.3 



Cutthroat Trout 54 3.3 - 9.2 



Mottled Sculpin 

 Longnose Sucker 



Standing crops of brook and cutthroat trout in the study section were 

 estimated using a mark-recapture method (Table 31). The section supported 

 approximately 677 brook trout and 63 cutthroat trout representing a combined 

 biomass of 45 pounds. Catchable fish (6 inches and longer) composed 16 per- 

 cent of the brook trout and 75 percent of the cutthroat populations. Brook 

 trout condition (length to weight ratio) was below average for Mount Haggin 

 streams. 



Table 31. Estimated standing crops of brook and cutthroat trout in a 1,000 

 ft. section of Willow Creek (T4N, RlOW, Sec. 31B) on August 5, 

 1980. Eighty percent confidence intervals are in parentheses. 



Per 1 ,000 ft . 

 Species Length Range (inches) Number Pounds 



Brook Trout 3.5 - 4.9 364 



5.0 - 6.4 262 



6.5-9.3 ^ 



677 (+73) 37 (+3) 



Cutthroat Trout 3.8 - 6.9 37 



7.0 - 9.2 26 



63 (+10) 8(+l) 



The Willow Creek study section supported the highest numbers and biomass 

 of trout of any of the Mount Haggin streams surveyed. It also supported the 

 only population of cutthroat trout that was large enough to estimate. These 



70 



