p=0.784). Therefore, the Base and Highbase datasets were excluded from further 

 analysis. Rainbow trout catch rates for datasets Edits and Editshigh were significantly 

 different (t-tests; p=0.0025). I report catch rates from both sets because of the upward 

 bias created by excluding unsuccessful anglers (Edits) and downward bias by projecting 

 unsuccessful anglers (Editshigh). However, the Editshigh dataset was considered the 

 least biased and most precise. 



In general, rainbow trout catch rates were much higher than brown trout, although long- 

 term gill net catch per effort is similar between species (Byorth and Weiss 2002). Over 

 the whole reser\'oir for all strata, rainbow trout were caught at an average rate of 0.31 per 

 hour. Brown trout catch rates averaged 0.09 per hour. Mountain whitefish and Utah 

 chub are quite common in the reservoir but were caught at low rates. Mountain whitefish 

 catch rates averaged 0.02 per hour oxer the entire creel survey, while Utah chub were 

 only caught at a rate of 0.03 per hour. 



Rainbow trout catch rates varied between the North and South halves of the reservoir 

 (Fig. 3). While catch rates for rainbow trout peaked at higher rates on the South side, 

 rates were more consistent on the North side, ranging from 0.2 to 0.4 per hour. Highest 

 catch rates on the South side were recorded during strata in which ice melted and formed. 

 Brown trout catch rates were also generally lower on the North side and the best catch 

 rates were recorded during ice melt and formation (Fig. 4). 



o 



0. 



o 



1.2 

 1 



0,8 

 0.6 

 0.4 

 0.2 

 



nRB-Edits High aRB-Edits 



North Half 



1 



u 



i 



I 



South Half 



-[ 



i 



1 



a 



Stratum 



Figure 3. Summary of catch per hour of rainbow trout (RB), by two analysis methods in 

 the North half (left bar cluster) and South half (right bar cluster) of Hebgen Reservoir 

 during creel survey by stratum from June 12, 2000 ("600") to June 1 1, 2001 ("601"). 



