Scale Analysis Lisa Borgerson Kanani Bowden Oregon Department of Fish and Wildlife 28655 Hwy 34 Corvallis, OR 97333 (541)757-4263 x232.

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Presentation transcript:

Scale Analysis Lisa Borgerson Kanani Bowden Oregon Department of Fish and Wildlife Hwy 34 Corvallis, OR (541) x232

 Age and Growth  Hatchery vs Wild  Life History  Species ID What We Learn From Scale Analysis: For Project CROOS we determine TOTAL AGE only

Ocean Entrance Annulus 1 Annulus 2 Annulus 3

Accuracy of Scale Aging 2006 Scale Reading Age Known Age Scale Reading Age Known Age Scale Reading Age Known Age %

Age Composition of CROOS chinook by month, 2006 _______________________________________________________ Percentage of sample Number of MonthAge 2Age 3Age 4Age 5Age 6scales aged ______________________________________________________ June July August September October Total ,045 Coastal OR CHF SGS ,266

Age Composition of CROOS chinook by month, 2007 _______________________________________________________ Percentage of sample Number of Percentage of sample Number of Month Age 2 Age 3 Age 4 Age 5 Age 6 Age 7 scales aged _______________________________________________________________________________________________________________________________________ May June July August ,324 September October Total ,456 ________________________________________________________

Age composition of Chinook salmon sampled by Area in 2007 ________________________________________________________________ Management Percentage at Age Number of Area Scales Read ________________________________________________________________ N. Oregon Coast S. Oregon Coast ,696 Klamath Mgt Zone Elk R. Bubble na Chetco R. Bubble Total na

________________________________________________________________ Stock Percentage at Age Number of Stock Percentage at Age Number of Group Scales Read Group Scales Read________________________________________________________________ British Columbia/ SE Alaska Washington Columbia River Oregon Coast California ,632 Age composition of Chinook salmon stock groups sampled in the ocean troll fishery off Oregon in 2007 N OR Coast Mid OR Coast Rogue N CA/S OR California Klamath ,232 CA Coast Central Valley

Comparison of contribution of Klamath stock (all ages) with Age-3 fish (all stocks) in Oregon Troll fishery, MayJuneJulyAugustSeptemberOctober Percent contribution NOC-KlNOC-age 3SOC-Kl SOC-age 3KMZ-KlKMZ-age 3

Comparison of contribution of Central Valley (all ages) with contribution of Age-4 fish (all stocks) in Oregon Troll Fishery, MayJuneJulyAugustSeptemberOctober Percent contribution NOC-CVNOC-age 4SOC-CV SOC-age 4KMZ-CVKMZ-age 4

Future Plans:  Continue to explore stock-age relationships  Determine if we can identify maturing and non maturing fish from their scales