| Yakima
River Steelhead Differentiation |
| Results |
| Introduction |
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| • | Multiple
collections from a single site tend to be genetically |
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| similar |
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| Exceptions: |
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| 1) Two Ahtanum
collections slightly different |
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| 2) Naches R.
and Roza Dam similar |
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| • | Populations are
differentiated based on geography |
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| • | Ahtanum a distinct stock |
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| SH
Population |
| Roza
Dam SH |
| Resident
Trout |
| Prosser
Dam |
| Conclusions |
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| • | Evidence suggests little
introgression from hatchery steelhead |
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| Small
et al. (2006) |