Difference between revisions of "Natal Origins Project (NO)"

• The Lees Ferry Rainbow Trout Fishery Page
• Nutrients Page

Initial investigations found:

• Efficacy of Mechanical Removal is dependent on immigration levels
• 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

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