The 



Of the 27 telemetered RBT, we successfully tracked 15 to spawning tributaries, 

 remaining 12 either made no 

 spawning-related movements 

 (n=3), or exhibited river 

 movements only during the 

 spawning period (n=9). 

 Tracking began March 2004 

 and continued into December 

 2005. We made 1,757 

 contacts and averaged 65 

 contacts (range: 9-83) for 

 each fish. A summary of all 

 RBT locations for 2004 and 

 2005 is located on Figure 50. 

 Of twenty 2005 presumed 

 Oncorhynchus mykiss (RBT) 

 that underwent DNA 

 analysis, eighteen (90%) 

 possessed genetic markers 

 consistent with either 

 rainbow trout (n=l) or late 

 generation RBT x WSCT 

 hybrids (n=17) with a 

 predominant rainbow genetic 

 composition (Appendix I). 



River temperatures were 

 slightly higher and runoff 

 began earlier in 2004 than 

 2005. RBT began their 

 tributary spawnin 



migrations on March 19' 

 (range: 34 days) in 2004 and 

 March 30'** (range: 34 day) in 

 2005. Migrations began 



on the rising limb of the 

 hydrograph, as temperatures 

 approached 43 °F. (Figure 

 51). Fourteen RBT 



migrated upstream, and one 

 moved downstream before 

 ascending spawning streams. 

 Blackfoot River migrations 

 averaged 8.7 days (median 

 9.0; range 1-25), and covered an average distance of 5.8 miles (median 3.4; range 0.3- 

 35.1) before ascending tributaries. Streams entered by RBT varied in size fi"om 1^' to 4"^ 

 order. Rainbow trout spawning occurred in 5 tributaries (East Twin (n=l). Gold Creek 



Figure 51. Relationship of discharge (top) and temperatures (bottom) to 

 dates RBT began migrations in 2004 and 2005. 



75 



70 



65 



£ 60 



S^ 55 



i ^ 



i. 45 



J 40 



35 



30 



25 



i 



2 I 

 1« 



•^.^^-^"^/^^ 





^ ^ 



www 



.^" 



/ 



# 



/ 



i 



Date flah entered 



Figure 52. Relationship of water temperatures to dates RBT entered 

 Monture Creek, 2004 and 2005. 



$$ 



