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

Broodstock and Weir Management for Chinook Salmon hatchery programs in Idaho

Brian Leth, IDFG


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


Broodstock and weir management for chinook salmon hatchery programs in idaho

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

fish hatcheries.


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