Pilot Mark-Recapture Study to Estimate Delta Smelt Pre-screen Loss and Salvage Efficiency G. Castillo 1 ; J. Morinaka 3 ; B. Baskerville-Bridges 2,4 J. Lindberg 2 ; R. Fujimura 3 ; J. Dubois 3 ;G. Tigan 2,3 ; V. Poage 1 1 U.S. Fish & Wildlife Service 2 Fish Conservation and Culture Laboratory-UC Davis 3 California Department of Fish & Game 4 Currently U.S. Fish & Wildlife Service
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Pilot Mark-Recapture Study to Estimate Delta Smelt Pre-screen Loss and Salvage Efficiency G. Castillo 1 ; J. Morinaka 3 ; B. Baskerville-Bridges 2,4 J.
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Pilot Mark-Recapture Study to Estimate Delta Smelt Pre-screen Loss and Salvage Efficiency
G. Castillo1; J. Morinaka3; B. Baskerville-Bridges2,4
J. Lindberg2; R. Fujimura3; J. Dubois3 ;G. Tigan2,3; V. Poage1
1 U.S. Fish & Wildlife Service2 Fish Conservation and Culture Laboratory-UC Davis3 California Department of Fish & Game4 Currently U.S. Fish & Wildlife Service
DWR
Study Area
Skinner Fish Facility
IntakeRadialGates
CliftonCourtForebay
to S
WP P
umps
DWR
SkinnerFish SalvageFacility
DWR
DWR
Skinner Fish Salvage Facility
to SWP Pumps
Primary Louvers
Water Intake
Collection and Transport
Trash Rack
Holding Tank
Project Goals
To estimate:
1. Delta smelt’s pre-screen loss at Clifton Court Forebay (CCF)
2. Salvage efficiency of delta smelt at the Skinner Fish Facility
Objectives
1. Develop a mass-marking method for juvenile & adult delta smelt
2. Refine mark-recapture method to evaluate delta smelt’s salvage efficiency at Skinner Fish Facility (SWP)
3. Conduct preliminary mark-recapture tests in Clifton Court Forebay (CCF) to refine methods to estimate pre-screen loss of delta smelt
Marking Method
• Cultured Delta smelt FCCL-UC Davis
• Used SE-Mark Calcein under INAD process
• Calcein concentrations: 2.5 g/L (juveniles) and 5.0 g/L (adults)
• Calcein immersion tests: 0, 1, 3, 5, 7 min.
• Daily post-marking survival
• Calcein detector: fins (pelvic, pectoral, caudal), operculum, jaw, scales • Two independent marking grade evaluations using calcein detector
Evaluation of Mark- Recaptured Delta Smelt
Calcein Marking Results
• 100% mark retention within 1 month post-marking
• Higher mark intensity with increasing immersion time