Introduction
Conclusions
Resident Trout
Roza Dam SH
SH Population
Prosser
Dam
Can individual steelhead be identified to
Yakima Basin
population of origin from mixed collections
at Prosser Dam?
Steelhead Capture At
Prosser Dam
Individual assignment
method
• Jack-knife assignment of all Yakima River
steelhead present
in
reference baseline
• Assignment precision is assessed by observing
the correct and
incorrect assignments back to population of origin
• Type-1 error: individuals not assigned to
population of origin
• Type-2 error: individuals falsely assigned to
a population