Nisqually chinook status and trends
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Nisqually chinook status and trends

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Nisqually chinook status and trends Nisqually chinook status and trends Presentation Transcript

  • Nisqually Chinook Recovery Plan Annual Review Nisqually Wildlife Refuge February 8, 2011
  • Introduction:
    • Craig Smith!
    • Nisqually Harvest Program Manager
    • Nisqually Chinook
    • STATUS AND TRENDS SESSION 1
  • Definitions:
    • HORs – Hatchery Origin Recruits or fish of hatchery origin.
    • NORs - Natural Origin Recruits or fish of natural spawned origin (natural).
    • Marked - A hatchery fish that has the adipose fin clipped.
    • Unmarked - A hatchery fish without the adipose fin clipped OR a natural fish
    • Exploitation Rate -Total mortality in a fishery or aggregate of fisheries divided by the sum of total fishing and natural mortality plus escapement.
    • Harvest Rate - Total fishing mortality, in some cases of a specific stock divided by the abundance in a given fishing area at the start of a time period.
    • Rebuilding Exploitation Rate - The impact of harvest that will not significantly impede the opportunity for the population to grow towards the recovery goal .
    • Extreme Terminal Run Size - The number of fish returning to a specific place or river.
    • Escapement - The fish that escape all fisheries to their respective spawning area such as the hatchery or the natural spawning grounds.
    View slide
  •   View slide
  • Session 1
    • Past Trends
    • Run size and Composition
        • Hatchery Origin Recruits and Natural Origin Recruits will be referred to as HORs and NORs, respectively
    • Terminal Catch and Composition
    • Escapement and Composition
  • Past Trends :
    • Run size and Composition (NORs and HORs)
    • The last 7 year average hatchery run size is 29,412 to the river (95%).
    • The last 7 year average natural run size is 1,614 to the river (5%).
    • Total hatchery and natural run size of 31,026.
  •  
  • Treaty Catch and Extreme Terminal Run Size
    • Since 2001, the Chinook total run size back to the Nisqually river has ranged from 26,000- 42,000.
    • Since 2001, Nisqually treaty harvest rate has averaged 60% which has yielded between 11,000-23,000 Chinook.
  •  
  • Terminal Catch and Composition
    • Recent 7 year average Treaty hatchery fish commercially harvested was just under 16,000 fish per year.
    • Recent 7 year average Treaty natural fish commercially harvested was 980:
      • roughly 5% of the catch
    • 7 year average sport harvest not including 2010 is ~1,500.
  • Sport Not included in 2010
  • Spawning Ground Escapement and Composition
    • Recent 7 year average escapement to the spawning grounds: ~2,200
    • ~1,600 hatchery strays
      • 73% HORs on the spawning grounds
      • Recovery plan goal is 10%
    • ~600 natural Chinook
      • 27% NORs on spawning grounds
      • Recovery plan goal is 90% NORs
  •  
  • ?????????????Questions???????????