chinook salmon adult abundance monitoring project 199703000 dave faurot nez perce tribe pacific...
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Chinook Salmon Adult Abundance Monitoring
Project 199703000
Dave Faurot
Nez Perce Tribe
Pacific Northwest National Laboratory
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Goal
•Accurately and precisely quantify adult spring and summer chinook salmon spawner abundance in the Secesh River and Lake and Marsh creeks on an annual basis using state-of-the-art technologies
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Expected Products:
• Accurate determination of adult abundance• Determination of run timing
• Comparison of abundance numbers with
expanded redd count estimates
• Accurate fish per redd number
• Percent of hatchery strays into Lake and Marsh creeks
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Relationships to:: 2000 NMFS Bi OP
• RPA 13 – Information for evaluation checks at 1, 3, 5 and 8 years
• RPA 179 – Assess population status for progress toward ESU recovery goal
• RPA 180 – Tier 2 level population status
• RPA 184 – Population status monitoring
• RPA 193 – Investigation of state-of-the-art novel fish detection technologies
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Relationships to: Subbasin Summary
Fish and Wildlife Needs
• Non-invasive monitoring technologies 5.4.1
• Improved wild population status information 5.2.3.a
• Adult spawner abundance 5.4.2
• Adult migration patterns 5.4.2
• Run timing 5.2.2.a
• Spawner to spawner ratios 5.4.2
• Population trends 5.2.1
• Listed Stock Escapement Monitoring project 5.3.1
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Critical Uncertainty: Population Status
How many fish are there?
“Therefore, more accurate counts of returning adults to natal spawning grounds are necessary to evaluate recovery efforts matrix threshold goals” (NMFS 2000)
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Redd Counts:an index of relative abundance
•If the goal is to increase the number of salmon, then the variable of interest is the number of fish (Botkin et al. 2000 – Validation Monitoring).
•Index area redd counts in Idaho were not designed to provide escapement estimates (Kiefer et al. 1996).
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Redd count expansions: 2.31 Average SFSR PATH1.18 Weak year class, Lake Creek1.64-6.04 Range, Imnaha River
•Expansions of redd counts to spawner and recruit numbers are influenced by measurement error and uncertainty of assumptions regarding estimates of fish per redd, relative numbers in surveyed and unsurveyed areas, prespawning mortality rates, age composition, hatchery fish contributions, and conversion rates of adults returning through dams and fisheries (Beamesderfer 1998).
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ISS Index
ISS Intensive
PATH Intensive
PATH Index
ISS Intensive
PATH Index
PATH Intensive
ISS IndexLake Creek Spawner Abundance
1998 1999
Year
Dif
fere
nce
(%
)
-100
0
100
200
300
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Flow
Lake Creek
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Monitoring and Evaluation Results
Lake Creek Secesh River
Snorkel 1997 -- No impact
1998 No impact No impact
1999 No impact No impact
Visual 1997 -- No impact
1998 No impact No impact
1999 No impact No impact
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Summary of Major Activity in Lake Creek
Activity 1998 1999 2000 2001
First Fish 8 July 11 July >22 June 9 June
Peak Net Up 18 July 20 July 27 Jun 24,28June
Peak Activity 6 Aug 19 Aug 7 Aug 19 Aug
Last Fish 26 Aug 3 Sep 31 Aug
Abundance 52 60 >311 ~615
Fish per redd 1.18 2.88 >1.73
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Secesh River Site
Flow
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Deep Creek Barrier
Barrier
Sampling area
Transducer
Flow
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Marsh Creek
Flow
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Vaki
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