Introduction
Prosser Dam
Resident Trout
Roza Dam SH
SH Population
Conclusions
Conclusions
• Yakima Basin steelhead genetically
differentiated by watershed
• Although Naches River and upper Yakima
similar
• Evidence suggests limited hatchery
introgression into natural
populations
• Allele frequencies for replicated Roza Dam
collections are
temporally stable
• Genetic dataset for
five replicated collections from Roza Dam
should be combined to form a single genetic
baseline sample
• Roza Dam data are consistent with the
presence of a single
steelhead population above Roza Dam