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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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

  • 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

  • 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

  • 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

  • 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 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 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

  • Insufficient NORs to integrate the entire hatchery program

  • Reduced productivity in the hatchery environment??


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

  • 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 Management

  • Used to manage integrated and natural populations

  • Decisions are driven by the size of the natural population


Sliding Scale - Broodstock and Weir Management

  • Influence of Natural Environment in the Hatchery


Sliding Scale - Broodstock and Weir Management

  • Influence of Hatchery in the Natural Environment


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

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


Special thanks to the staffs at Pahsimeroi, Sawtooth, and McCall

fish hatcheries.


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