Redfish Lake Sockeye Salmon

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Redfish Lake Sockeye Salmon Captive Broodstock
Program
Project 199107200
Prepared by
Paul Kline Lance Hebdon
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Program Cooperators

• IDFG Captive broodstocks, monitoring
  evaluation, fish health.

• NMFS Captive broodstocks, captive research,
  fish health.

• Shoshone-Bannock Tribes Habitat investigations,
  monitoring and evaluation.

• University of Idaho Genetic investigations.

• Bonneville Power Funding, SBSTOC coordination.

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IDFG Program Goals
Avoid population extinction using captive
technology.
Tier 1
Conserve population genetic diversity.
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IDFG Program Goals
Avoid population extinction using captive
technology.
Tier 1
Conserve population genetic diversity.
Increase the number of individuals in the
population.
Tier 2
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IDFG Program Goals
Avoid population extinction using captive
technology.
Tier 1
Conserve population genetic diversity.
Increase the number of individuals in the
population.
Tier 2
De-list the population (draft NMFS plan).
Tier 3
Provide sport and treaty harvest opportunity.
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Primary Program Objectives

• Objective 1. Develop captive broodstocks from
  Redfish
• Lake anadromous sockeye salmon. Culture
  broodstocks.

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Primary Program Objectives

• Objective 2. Determine the contribution
  hatchery-produced
• sockeye salmon make toward recovery.

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Methods Objective 1

• Maintain hatchery and weir facilities.
• Modify and repair facilities to meet program
  needs.
• Develop spawning designs and spawn adults.
• Cryopreserve milt.
• Monitor hatchery outcomes (e.g., growth,
  maturation, spawning).
• Produce eggs and fish to meet broodstock needs.
• Produce eggs and fish to meet reintroduction
  plans.
• Use existing and emerging conservation practices
  to culture fish.

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Captive Broodstock Concept
Spawn Source Adults
F2
Release Second Generation
F1
Reintroductions
F2
Hold First Generation
First Generation Adults
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Annual Design for the Production of Eggs to
Meet Broodstock and Reintroduction program needs
In Any Spawn Year
Broodstock Production
Release Production
Approximately 400 eggs retained to become future
broodstock adults
Up to 400,000 eggs produced for reintroduction
to the natural habitat
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Sockeye Salmon Eyed-egg Production at Eagle
Hatchery (1991 through 2000)
Total eyed-eggs 873,514
Mean survival to eye for wild females 76
Mean survival to eye for hatchery females 55
Number of Eyed-Eggs
Spawn Year
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Methods Objective 2

• Maintain and operate juvenile and adult weirs.
• Mark and tag juvenile sockeye salmon.
• Plant eggs, juveniles and adults.
• Estimate outmigration success by release
  location and strategy.
• Evaluate outmigration success by release
  location and strategy.
• Evaluate adult return success by release
  location and strategy.
• Identify spawning location and timing for
  pre-spawn adults.

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Sockeye Release Strategies
Release Strategies

• Three lake program.

• Eyed-eggs to hatch boxes.

• Sub-yearlings direct to lakes (July and October).

• Sub-yearlings to net pens (Redfish Lake, October
  release).

• Yearling smolts to Redfish Lake Creek and upper
  Salmon R.

• Pre-spawn adults direct to lakes.

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Sockeye Program Nursery Lakes
Salmon River
Salmon River
Monitoring Weir
Pettit Lake
Supplemented Since 1995
Monitoring Weirs
Supplemented Since 1993
Supplemented Since 1997
Redfish Lake
Alturas Lake
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Reintroduction Numbers by Release Strategy for
Redfish, Alturas and Pettit lakes (combined data
for 1993 through 2000)
617,590
Number of Fish
296,278
106,820
617
Release Strategy
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Estimated Out-migration by Release Strategy for
Redfish, Alturas and Pettit lakes (combined data
for 1993 through 2000)
125,514
106,820
Number of Fish
5,735
Release Strategy
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Outmigration Success of Hatchery-Produced Smolts
from Two Redfish Lake Release Strategies
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Anadromous Adult Sockeye Salmon Returns to the
Stanley Basin (1991 through 2001)
257
Number of Fish
16 wild/natural adults 1991 - 1998
4
1
8
1
0
1
0
1
7
13
Adult Return Year
19
Origin of Hatchery-Produced Adult Sockeye Salmon
Returns
Percent of Total Return
Adult Return Year
20
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