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Pilot Mark-Recapture Study to Estimate Delta Smelt Pre-screen Loss and Salvage Efficiency

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

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Pilot Mark-Recapture Study to Estimate Delta Smelt Pre-screen Loss and Salvage Efficiency

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  1. 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 Service 2 Fish Conservation and Culture Laboratory-UC Davis 3 California Department of Fish & Game 4 Currently U.S. Fish & Wildlife Service

  2. Clifton Court Forebay Intake Radial Gates Study Area Skinner Fish Facility to SWP Pumps DWR DWR

  3. Skinner Fish Salvage Facility DWR DWR

  4. Skinner Fish Salvage Facility Trash Rack Primary Louvers Water Intake Collection and Transport toSWP Pumps Holding Tank

  5. 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

  6. Objectives • Develop a mass-marking method for juvenile & adult delta smelt • Refine mark-recapture method to evaluate delta smelt’s salvage • efficiency at Skinner Fish Facility (SWP) • Conduct preliminary mark-recapture tests in Clifton Court Forebay • (CCF) to refine methods to estimate pre-screen loss of delta smelt

  7. 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

  8. Evaluation of Mark- Recaptured Delta Smelt

  9. Calcein Marking Results • 100% mark retention within 1 month post-marking • Higher mark intensity with increasing immersion time • Post-marking survival increased with: • - Reduced light exposure (shaded windows) • - Water temperatures < 16.5 oC • At least 90% average survival 1 week after marking • - Protocols to limit handling stress • Similar survival between marked fish and unmarked control fish

  10. 3 Center CCF West CCF Fish Facility 2 1 DWR

  11. Transport of Marked Delta Smelt to Skinner Fish Facility

  12. Release at Skinner Fish Facility - Trash Rack (June 4) • Near noon (4 groups 30 min. apart) • Released 200 fish (50 fish per group / 5 gallon bucket x 4 groups) • Release conducted c.a. 1 hr after export began (2,260 cfs)

  13. Fish Releases at Skinner Fish Salvage Facility

  14. Recaptures of Marked Delta Smelt Skinner Fish Facility Release W = Wild fish M = Marked fish

  15. Transport of Marked Delta Smelt to CCF

  16. Release in West Side of CCF (June 12) • Daylight morning hours (two groups within minutes) • Released 500 fish (250 fish per group / 80 L carboy x 2 groups) • Release conducted c.a. 20 min. after exports began (375 - 2,260 cfs)

  17. Fish Releases in Clifton Court Forebay

  18. Recaptures of Marked Delta Smelt West CCF Release W = Wild fish M = Marked fish

  19. Release Near the Center of CCF (June 26) • Daylight morning hours (5 groups within minutes) • Released 2,647 fish (c.a. 500 fish per group / 80L carboy x 5 groups) • Release conducted c.a. 7 hours after exports began (2,260 - 3,390 cfs) • Concurrent release of drifters at release site (hydrodynamic study)

  20. Recaptures of Marked Delta Smelt Center CCF Release W = Wild fish M = Marked fish

  21. 3 2 1 Recapture Trash Rack West CCF Center CCF Percent 30 8 2 Days 1 5 7

  22. Ambient Temperature Controls for Marked Delta Smelt Fish transported to outdoor holding tank (n=100) Daily Feeding and monitoring: -Temperature -Turbidity -Survival

  23. Delta Smelt Controls for two Releases in CCF

  24. Conclusions 1- Calcein seems appropriate for mass mark-recapture experiments on juvenile and adult delta smelt 2- Significant decrease in percent of recapture and increased time of recapture with distance to Skinner Fish Facility 3- Water temperatures above 25 oC may have increased mortality of juvenile delta smelt in Clifton Court Forebay

  25. Acknowledgements Cooperation & Coordination: Luke Ellison (FCCL-UC Davis) Jennifer Messineo (DFG) Kim Webb (USFWS) Raul Piedrahita (UC Davis) Theresa Rettinghouse (FCCL-UC Davis) Marty Gingras (DFG) Paul Cadrett (USFWS) Robert Clarke (USFWS) Sheryl Moore (DWR) Cathy Ruhl (USGS) Kevin Clark (DWR) Ed Gross (EC) Mark Bowen (USBR) Michael McWilliams (EC) Ted Sommer (DWR) Pete Smith (USGS retired) Andy Chu (DWR) Brynn Hooton (DFG) Denise Barnard (DFG) Paul Miklos (USFWS) Mike Marshall (USFWS) Science Aids (DFG) Katherine Kellogg-Campbell (DFG) Carlie Jackson (DFG) Crystal Kaphaem (DFG) Funding: CALFED Science Program Interagency Ecological Program U.S. Fish and Wildlife Service

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