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Timing and distribution of naturally produced coho salmon in the lower Columbia River. Presentation overview. Background Preliminary results Management implications Conclusions & recommendations. Background. Declines in lower Columbia River coho salmon - PowerPoint PPT Presentation
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Timing and distribution of naturally Timing and distribution of naturally produced coho salmon in the lower produced coho salmon in the lower
Columbia RiverColumbia River
Presentation overviewPresentation overview
Background Background Preliminary resultsPreliminary results Management implicationsManagement implications Conclusions & Conclusions &
recommendationsrecommendations
BackgroundBackground Declines in lower Columbia River coho salmon Declines in lower Columbia River coho salmon Hatchery supplementation reestablished abundanceHatchery supplementation reestablished abundance Reduced genetic diversity and hatchery effects on populationReduced genetic diversity and hatchery effects on population Federally listed in 2005 as “threatened”Federally listed in 2005 as “threatened” Critical uncertainties research needed (avoidance vs mark selective)Critical uncertainties research needed (avoidance vs mark selective)
Conceptual conditionConceptual condition
TimeTime
Estuary Estuary ReceiverReceiverMainstem GateMainstem Gate
Tributary GateTributary Gate
Metric 2011 2012
Date of 1st effort 8/28/2011 8/7/2012Date of 1st capture 8/28/2011 8/7/2012Date of last effort 10/31/2011 10/30/2012Date of last capture 10/19/2011 10/30/2012Days fished 69 132Total coho captured 460 971Coho captured/day 6.7 7.4Total instrumented 129 303Total August instrumented 2 48Instrumented/day 1.87 2.30
129 coho instrumented in 2011, 303 in 2012
In 2011 16 heard in tributaries of interest, 15 over Bonneville
In 2012 39 heard in tributaries of interest, 44 detected over Bonneville
Excluding Willamette avg/trib ~ 2 fish
Only Washougal didn’t have coho detected at gates, but more had fish only hit at one or vacate
LCR Tributary 2011 2012Elochoman River 1 2Clatskanie River -- 1Mill Creek -- 0Cowlitz River 7 9Lewis River 1 5Scappoose Creek -- 0Clackamas River 0 1Washougal River -- 0Sandy River 1 2Willamette River 2 19
ResultsResults
ResultsResults
ResultsResults
YearUltimate Fate
LCR Tributary Bonneville Dam
2011 9/10/2011 9/8/2011
2012 9/15/2012 8/26/2012
ResultsResults
ConclusionsConclusions Multi-modal run-timing is not Multi-modal run-timing is not
apparent in 2012 for CR coho apparent in 2012 for CR coho salmonsalmon
Upper river fish appear to enter Upper river fish appear to enter river earlier than lower river river earlier than lower river counterpartscounterparts
Distance and speed positively Distance and speed positively correlatedcorrelated
Need to increase acoustic Need to increase acoustic presence in estuary tributaries presence in estuary tributaries to greater account for fishto greater account for fish
Need to increase transmitters Need to increase transmitters out to get better presence in out to get better presence in non-Willamette lower river non-Willamette lower river tributariestributaries
Desired StatusDesired Status