Shortnose gar (Lepisosteus platostomus) 



Pearl dace ( Semotilus margarlta ) 



Northern redbelly dace ( Phoxinus eos ) x f inescale dace 



( P. neogaeus ) 

 Trout-perch (Percopsis omiscomaycus) 

 Shorthead sculpin (Cottus confusus ) 

 Spoonhead sculpin (Cottus rlcei) 



GENETIC VALUE RATINGS FOR FISH 



. • 1/ 

 Rating Description- 



A - A genetically pure population as determined by electrophoresis that is 

 isolated from contaminating species. 



B - A potentially pure population where there is no record of 

 contaminating species in areas where spavming occurs (not applicable 

 to native rainbow trout as their purity can be determined only by 

 electrophorosis) 



C - A potentially pure population where no contaminating species exist, 

 but records indicate that a contaminating species (which could cause 

 hybridization) has been planted in the drainage or is present 

 elsewhere in the drainage and could invade. 



D - An especially valuable genetically pure cutthroat trout population 

 (determined by electrophoresis) or especially valuable bull trout 

 population where there are also contaminating species in the reach or 

 drainage. Introgression or hybridization may be static or receding 

 due to reproductive isolation. This rating may also apply to 

 sympatric populations of native and non-native rainbow trout. 



E - A potentially pure population where contaminating species are known to 

 exist. 



G - A genetically pure population could exist but is not present. 



H - A hybridized or introgressed population known to exist based on 

 electrophoresis. 



I - A genetically pure population, determined by electrophoresis, where 

 contaminating species could invade. Sometimes used instead of 

 genetics rating D for bull trout in order to upgrade an especially 

 important spawning stream. 



— (a) Contaminating species for native rainbow trout are: golden trout, 

 cutthroat trout and any hybrid Salmo except hybrid brown trout. 



(b) Contaminating species for westslope or Yellowstone cutthroat trout 

 are: rainbow, golden, other strains of cutthroat trout, and any 

 hybrid Salmo except hybrid brown trout. 



(c) Contaminating species for bull trout is brook trout. 



-11- 



