YCT Multi-state Assessment 



February 10,2003 



35% 



41% 



I Genetically unaltered (>99.0%) - tested via 

 electrophoresis or DNA 



Dlntrogressed (hybridized) - tested and found | 

 to be 75% to 99% YCT | 



I Introgressed (hybridized) - tested and found 

 to be less than 75% YCT 



I Potentially unaltered with no record of 

 stocking or contaminating species present 



I Suspected hybridized with records of 

 contaminating species being stocked or 

 occurring in stream 



I Hybridized and Pure populations exist in 

 stream (use only if reproductive isolation is 

 suspected) 



Figure 3. Genetic status of Yellowstone cutthroat trout expressed as proportion of currently 

 occupied habitats (in miles) classified within each genetic status category for 

 assessment done in 2001. 



Table 7. Genetic status for Yellowstone cutthroat trout (both spotting forms combined) by 

 stream length (miles) within their historical range as of 2001. 



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