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Natal Origins Project (NO)
From Glen Canyon Dam AMP
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There is a low probability for an individual fish to move large distances.
Abundance is a key factor: the more fish upstream in the Lees Ferry reach = more fish will move downstream
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Updates
[1]
[2]
[3]
[4]
Links and Information
The Lees Ferry Rainbow Trout Fishery Page
Nutrients Page
Background
Initial investigations found:
Efficacy of Mechanical Removal
RBT abundance was high and variable, partially offset by trout immigration
BNT were more predaceous than RBT
RBT were more numerous than BNT
Predation risk is a function of both density & predatory behavior
Information Needs:
What controls trout abundance?
Where were RBT migrants originating from?
What controls trout abundance?
Where were RBT migrants originating from?
How many sub-adult HBC move into the mainstem?
How variable was subadult HBC survival?
Was there a relationship between HBC survival & RBT abundance?
Outcomes:
Develop alternative sampling methods for determining trout and chub abundance and vital rates
Natal Origin Project: Movement and Trout dynamics
NSE/JCM Projects
: Juvenile HBC survival and other regulating factors
Presentations and Papers
2017
Natal Origin Project PPT
2016
[Natal Origins of Rainbow Trout Project, Years 1-4 (Nov 11 – Dec 15)]
2015
GCMRC Science Update - Trout
Update on the 2015 decline in fish condition and abundance at Lees Ferry
State of the Fishery Lees Ferry and Lees Ferry and Marble Canyon Rainbow Trout Update
Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon
Rainbow Trout Growth, Condition, Population Dynamics and Modeling in Glen Canyon
2014
New Insights on Trout from the Natal Origins Study
Fisheries Update
Natal Origins update
Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon
2013
GCMRC Update - Status of Resources and Sediment Conditions
Science Update: Fisheries
GCMRC Science Update on Sediment and Fisheries
Rainbow trout monitoring update
Natal Origins update
Grand Canyon Rainbow Trout 2012 Monitoring Results
Natal Origins: Glen Canyon and Marble Canyon
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