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