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Conclusions
Hatchery fish continue to return at smaller size-at-age than Natural origin fish
Increased proportions of age 3 jacks continues
Age 4 fish from all Yakima River populations have significantly declines in size since 2001
2006 was the first year we observed significant sexual dimorphism (females>males)
Spawn timing of hatchery fish at CESRF was once again earlier than natural origin fish
Notes:
I’d like to acknowledge the hard work and efforts by the Yakama Nation’s RAMF crew and the CESRF crew. Their cooperation and help was critical in making this work possible. And David Byrnes and BPA for funding support.