pit technology and hatchery mitigation j. murauskas and j. miller 0 use of pit technology to improve...
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PIT Technology and Hatchery MitigationJ. Murauskas and J. Miller 1
Use of PIT technology to improve hatchery mitigation in the Columbia
Presented by
Josh Murauskas and Joe MillerJanuary 27, 2015
PIT Technology and Hatchery MitigationJ. Murauskas and J. Miller 2
• Over 130 facilities
• Outdated agreements
Columbia R. Hatcheries
Columbia R. Chinook hatchery releases (from Levin et al. 2001)
PIT Technology and Hatchery MitigationJ. Murauskas and J. Miller 3
The Concept of Salmon Mitigation
Pre-project Unavoidable loss Mitigation Post-project
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PIT Technology and Hatchery MitigationJ. Murauskas and J. Miller 5
• Juvenile survival = 93%
• Returns = 46,500 wild fish
– Shortage of 3,500 adults
• Hatchery SAR = 0.5%
• 700,000 smolts to mitigate loss
Example Mitigation Calculation using PITs
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Example Baseline Estimates
Nego-tiated
SARs Carrying capacity
Egg-smolt Smolt trap pHOS -
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
16,000,000
Spring Chinook
Steelhead
An
nu
al sm
olt
pro
du
cti
on
6
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What is Fish Performance?
• Juvenile survival
• Smolt-to-adult returns
• Age structure
– All estimable with PITs
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Example Comparison of Programs
• 700,000 smolts
• 0.5% SAR
• 20% Age 3 returns
• 2,800 Age 4+ adults
• 400,000 smolts
• 1.3% SAR
• 10% Age 3 Returns
• 4,680 Age 4+ adults
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Age Structure (Chelan River, BY 2008)
n = 107 n = 175
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Reminder of PIT Infrastructure
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• Reduced phenotypic discrepancies with wild fish
• Minimized hatchery footprint
• Maximize value of dollar invested
• Improved nurture to meet nature’s design
Incentive-based Hatchery Programs
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• Mitigation should involve calculation of:
– The size of the pie
– How best to replace your piece
• By improving mitigation strategies, we can
enhance harvest and conservation programs
• Our PIT infrastructure a great backbone
Summary
