Fisheries Habitat and Fish Populations 



Number 25 ■ 

 of Fry 

 Captured 20 



15 



10 



5 + 

 



Figure D-2: Relationship between numbers of westslope cutthroat trout fry 

 successfully emerging from replicates of six gravel mixtures and 

 the percentage of material smaller than 6.35 mm in each mixture 



Survival = 

 -0.654812 (% < 6.35 mm) + 35.6749 

 p < 0.0005. r2 = 0.72. n = 17 



10 15 20 25 30 35 



Percentage of Material less than 6.35 mm 



40 



45 



Number 

 of Fry 40 

 Captured 



30 + 



20 



10 







Figure D-3: Relationship between number of bull trout fry 

 successfully emerging from replicates of six gravel mixtures and 

 the pereentage of material smaller than 6.35 mm in each mixture 



Survival = 

 -1.29462 (% < 6.35 mm) + 72.4615 

 p < 0.0005. r2 = 0.91. n = 17 



10 15 20 25 30 35 



Percentage of Material less than 6.35 mm 



40 



45 



50 



Flathead Basin Cooperative Program Final Report 



Page 57 



