107 



1970, average weights were relatively stable. 



The average length at each annulus for white suckers were as follows: 

 age I - 1.5 inches; II - 5.4 inches; III - 10.6 inches; IV - 13.4 inches; 

 V - 14.7 inches; VI - 16.3 inches; and VII - 17.0 inches (Peterson, 1971). 

 Suckers do not appear in the net catch in significant numbers until they 

 are at least 3 years old. 

 Brown Trout 



Brown trout were first captured in 1964. Between 1964 and 1969 mean 

 lengths increased, peaked in 1969, then decreased between 1969 and 1972 

 (Figure 5). 

 Burbot 



Burbot were first captured in 1966. Mean lengths increased between 

 1966 and 1970, peaked in 1970, then decreased between 1970 and 1972 

 (Figure 5). 

 Other Species 



A few brook trout were netted through 1969, after which no brook trout 

 were captured. Mountain whitefish never comprised more than 6.5% of the 

 catch. No whitefish were captured in 1972. A few carp were captured in 

 1968 and 1969. Seven small carp, 3.8 to 4.4 inches in length, were taken by 

 seining at night in 1970". Clark Canyon Reservoir does not support a pro- 

 lific population of carp. 



Tributary Fish Populations 

 Horse Prairie Creek 



Trout population estimates for a section of Horse Prairie Creek, located 

 approximately two miles upstream of Clark Canyon Reservoir, are given in 



