29 



any of the grouped-station sections except section 7-9, which itself had 

 significantly greater trout abundance than several of the other sections (Figure 5). 



The relative abundance of rainbow trout by number decreased in the upstream 

 direction, from about 80% of the trout population in the lowermost section to 

 about 49% in the uppermost section (Table 7). Brook trout rose in relative 

 abundance further upstream, their highest proportion being 51.4% of the trout 

 population in section 60-61. 



Few brown trout were captured in Bozeman Creek. Station 60 yielded the 

 most — four with total weight of 0.673 kg. Station 9 had the largest-sized 

 brown trout — three for a total weight of 1.374 kg. Mountain, longnose, and 

 white suckers were collected as a large proportion of the fish populations 

 in stations 7 through 14 and 21 through 24. 



Brown trout was the principal species collected in the urban sections 

 of Fleshman Creek. Other species captured in urban stations were rainbow 

 and brook trout. Brook trout (population data from Clancey and Gould 

 1982) was the only species collected in the Fleshman Creek control station. 

 Comparisons with Other Streams 



Trout abundance varies greatly throughout small streams of the Gallatin, 

 Madison, and Jefferson River drainages. There are 34 population estimates 

 available on 31 rather scattered stream sections with lengths of about 130 

 to 380 m on 17 creeks (Table 8). Trout biomass per unit length of stream 

 averaged 66 kg/km and ranged from 8.9 to 222 kg/km, with 50% of cases lying 

 between 27 and 87 kg/km. With those sections omitted which are known to have 

 been physically altered by artificial means (straightening or bank landfill, 

 urban and otherwise), the mean of the 20 more natural remaining cases was 77.5 

 kg/km, and 50% of the cases lay between 42 and 112 kg/km. 



