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Accepted for publication:
The YKFP spring chinook hatchery program was designed to minimize domestication effects.
OBJECTIVE: Compare first generation hatchery and wild origin fish returning from broodyears 1997 to 2000.
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OBJECTIVE: Compare first generation hatchery and wild origin fish returning from broodyears 1997 to 2000.
Do trait distributions of hatchery fish diverge from the integrated local wild population’s?
Yakima River Basin
Sex Composition
Proportion ♂ Upper Yakima: All ages
(post mortem CESRF samples)
Age Composition
Proportion Age 3 Adults
Mean Age Composition: BY 1997-2000
Migration and
Spawn Timing
Age 3 Median Passage Date At RAMF
Age 4 and 5 Median Passage Date At RAMF
Spawn Timing At CESRF
Size-at-Age
(reflecting growth rates)
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Fork length of hatchery and wild
smolts at Roza Trap (+1 SD)
Conclusions: Body Size Trends
Conclusions: Hatchery vs. Wild
Life History Traits
Acknowledgements
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Prop. ♂ Up Yakima R: Ages 4 and 5