Presentation on theme: "Chinook Salmon Adult Abundance Monitoring Project 199703000 Dave Faurot Nez Perce Tribe Pacific Northwest National Laboratory."— Presentation transcript:
Chinook Salmon Adult Abundance Monitoring Project 199703000 Dave Faurot Nez Perce Tribe Pacific Northwest National Laboratory
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
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
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
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
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)
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).
Redd count expansions: 2.31 Average SFSR PATH 1.18 Weak year class, Lake Creek 1.64-6.04 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).
ISS Index ISS Intensive PATH Intensive PATH Index ISS Intensive PATH Index PATH Intensive ISS Index Lake Creek Spawner Abundance 1998 1999 Year Difference (%) -100 0 100 200 300
Monitoring and Evaluation Results Lake Creek Secesh River Snorkel1997-- No impact 1998 No impact No impact 1999 No impact No impact Visual1997-- No impact 1998 No impact No impact 1999 No impact No impact
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