Table of contents

Slide 1

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.

Slide 5

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