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The Problem – Pre-Screen Loss at Clifton Court Forebay

The Problem – Pre-Screen Loss at Clifton Court Forebay. The Plan – A Multi-pronged Approach. Veronica Wunderlich Bay-Delta Office, Delta Conveyance, Fish Science. Investigations of Predator-Prey Dynamics in the Clifton Court Forebay to Guide Approaches to Reducing Pre-Screen Losses.

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The Problem – Pre-Screen Loss at Clifton Court Forebay

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  1. The Problem – Pre-Screen Loss at Clifton Court Forebay The Plan – A Multi-pronged Approach Veronica Wunderlich Bay-Delta Office, Delta Conveyance, Fish Science Investigations of Predator-Prey Dynamics in the Clifton Court Forebay to Guide Approaches to Reducing Pre-Screen Losses Clifton Court Forebay is the regulating reservoir whereby water is diverted from Old River into the State Water Project (SWP) Harvey O. Banks Pumping Plant, and ultimately into the California Aqueduct. NMFS has required that DWR implement the reasonable and prudent alternative (RPA) action (IV 4.2(2)) of the Biological Opinion and Conference Opinion on the Long-term Operations of the Central Valley Project and State Water Project (NMFS 2009) to reduce predation of ESA protected salmon and steelhead within the Forebay. Fish Entrainment at Clifton Court Forebay • Fish enter the Forebay via the radial gates • Fish must cross 2.1 mile width of Forebay to Skinner Fish Protective Facility (SFPF) where they can be salvaged and released. Pre-Screen Loss (PSL; loss of fishes within the Forebay prior to salvage) • High rate of PSL for Chinook salmon and steelhead. • Predation is considered synonymous with PSL. • Reduction in predation is needed. • Predator-Prey dynamics are poorly understood in the Forebay. • Striped Bass are considered primary predator of salmonids. Understanding Predator/Prey Interactions: • Striped bass abundance, residence time, seasonal demographics, and predation habits. • Abundance, residence time, seasonal demographics, and predation habits of non-striped bass fish and bird predators . Salmonid Survival: • Salmonid pre-screen survival • Catch Per Unit Effort The Results - Reporting Annual update reports with findings (if available) and recommendations. Final Synthesis Report at the end of the final year of the study, summarizing the findings. The Objectives – Finding the Culprits The Team – Collaborators Principle Investigator – Veronica Wunderlich (vwunderl@water.ca.gov) Project Manager – Kevin Clark Support Staff: DWR - Bay-Delta Office, AECOM, Hansen Environmental, West Inc., HTI, and Cramer Fish Sciences. Skinner Fish Protective Facility Radial Gates

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