broodstock and weir management for chinook salmon hatchery programs in idaho
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Broodstock and Weir Management for Chinook Salmon hatchery programs in Idaho. Brian Leth, IDFG. Wutch you talkn bout Willis…. Segregated Broodstock Integrated Broodstock Supplementation. Segregated Broodstock. Only use hatchery-origin fish in brood stock

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Presentation Transcript
wutch you talkn bout willis
Wutch you talkn bout Willis…
  • Segregated Broodstock
  • Integrated Broodstock
  • Supplementation
segregated broodstock
Segregated Broodstock
  • Only use hatchery-origin fish in brood stock
  • Developing a group of fish that is successful in the hatchery and provides mitigation for lost harvest opportunity
    • Selection favors fish that do well in the hatchery environment
  • Hatchery and natural populations not intended to interbreed
    • Spatial or temporal separation
integrated broodstock
Integrated Broodstock
  • Incorporating natural fish into the hatchery broodstock (variable levels)
  • Minimize divergence of hatchery and natural populations
  • Provides a reserve for natural population in the hatchery
  • A better candidate for supplementing natural populations (conservation objectives)
supplementation
Supplementation
  • The intentional release of hatchery produced individuals into the natural environment for the purpose of contributing to natural production
  • NORs = Natural Origin Returns
to integrate or not to integrate that is the question
To integrate or not to integrate…. that is the question
  • Depends on Management Objectives and Situation
    • Conservation or mitigation, or both
    • Perceived risks to natural population from the hatchery program.
to integrate or not to integrate that is the question1
To integrate or not to integrate…. that is the question
  • Depends on Management Objectives and Situation
    • Conservation or mitigation, or both
    • Perceived risks to natural population from the hatchery program.
  • Uncertainty Related to Using Hatcheries as a Tool to Recover Natural Populations
    • Level of integration
    • Program size relative to natural population
    • HSRG, HRT, AHA
to integrate or not to integrate that is the question2
To integrate or not to integrate…. that is the question
  • Depends on Management Objectives and Situation
    • Conservation or mitigation, or both
    • Perceived risks to natural population from the hatchery program.
  • Uncertainty Related to Using Hatcheries as a Tool to Recover Natural Populations
    • Level of integration
    • Program size relative to natural population
    • HSRG, HRT, AHA
  • Maintain Mitigation Program while Managing Risks
    • Reduce impacts to natural population
    • A better candidate for supplementation
issues constraints of integration
Issues/Constraints of Integration
  • Insufficient NORs to integrate the entire hatchery program
  • Reduced productivity in the hatchery environment??
alternatives to full integration
Alternatives to Full Integration
  • Stepping Stone Integration
    • Maintain two broodstocks
      • Integrated component for supplementation
      • Segregated component used for harvest mitigation
    • As NORs increase there is opportunity to integrate a larger component of total production
    • Facility constraints associated with managing multiple broodstocks
sliding scale broodstock and weir management
Sliding Scale- Broodstock and Weir Management
  • Used to manage integrated and natural populations
  • Decisions are driven by the size of the natural population
  • Reduce hatchery influence in nature and increase natural influence in the hatchery
sliding scale broodstock and weir management1
Sliding Scale- Broodstock and Weir Management
  • Used to manage integrated and natural populations
  • Decisions are driven by the size of the natural population
sliding scale broodstock and weir management2
Sliding Scale - Broodstock and Weir Management
  • Influence of Natural Environment in the Hatchery
sliding scale broodstock and weir management3
Sliding Scale - Broodstock and Weir Management
  • Influence of Hatchery in the Natural Environment
sliding scale broodstock and weir management4
Sliding Scale - Broodstock and Weir Management
  • Management of Programs
    • Decisions based on size of natural population
      • difficult to forecast
    • Requires more inseason coordination/communication and adaptive management
integrated chinook salmon programs
Integrated Chinook Salmon Programs

Pahsimeroi, Upper Salmon and SF Salmon rivers

  • 2010- Initiated Broodstock Development
  • 2013 and Beyond
    • Implement sliding scale for supplementation and broodstock management
    • Monitor production and productivity of hatchery and natural populations and RRS
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