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Project: Impacts of Spatial & Temporal Dynamics of Water Flows on Migratory Behavior of Chinook Salmon Smolts in the South Delta

Description: Funding for this study project will be use track the swimming movements of salmon smolts during migration using acoustic transmitters and detection arrays near the confluence of Old River and the San Joaquin River. Analyses will be carried out to determine swimming velocity relative to current velocity. Modeling will estimate fish distribution; fish transit times; entrainment of fish into channels of the south Delta; and alternative water export management scenarios that may result in reduced entrainment.

Reference Number: 3600BP1796017

Implemented By: Regents of the University of California

Objective: Project objectives are to: 1. Determine whether juvenile salmon remain immobile in the water column, being transported passively by the currents or whether they are active swimmers. 2. If they are active swimmers, whether they swim in random directions or they swim with persistent directionality relative to tidal currents. 3. If they are active swimmers, determine which environmental stimuli (current velocity, proximity to shore, etc.) trigger swimming behavior. 4. Determine whether night-time swimming behavior differs from daytime swimming behavior. 5. Describe any relationships between the export to inflow ratio and the survival of migrating downstream spring-run smolts. 6. Estimate the entrainment risk of juvenile salmon by water export facilities in the south Delta under different tidal and export conditions.

Type: Research/Planning (including Science)

Total Cost: $1,510,723.00

Project Status: Project Implementation

On Time?: Yes    Within Scope?: Yes    Within Budget?: Yes

Estimated Completion: 4/30/2021    Actual Completion:

Associated Counties: Multiple

Project Benefits a Disadvantaged Community (or SDAC): Yes

Contribution SourcesContribution DateContribution Amount
Prop. 1, Water Quality, Ecosystem Restoration and Fish Protection Facilities - Delta11/21/2017$1,510,723.00

Project MetricMetric TopicQuantityUnit
Research/Planning (including Science)Other  

Water Action Plan Target

Protect and Restore Important EcosystemsAction Description


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