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Trinity River Basin Salmon and Steelhead Monitoring Project

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Trinity River Basin Salmon and Steelhead Monitoring Project State of California The Resources Agency DEPARTMENT OF FISH AND WILDLIFE ANNUAL REPORT TRINITY RIVER BASIN SALMON AND STEELHEAD MONITORING PROJECT: CHINOOK AND COHO SALMON AND FALL-RUN STEELHEAD RUN-SIZE ESTIMATES USING MARK-RECAPTURE METHODS 2017-18 SEASON On the cover: Rainbow over the Trinity River. October 2017. State of California The Resources Agency DEPARTMENT OF FISH AND WILDLIFE ANNUAL REPORT TRINITY RIVER BASIN SALMON AND STEELHEAD MONITORING PROJECT: CHINOOK AND COHO SALMON AND FALL-RUN STEELHEAD RUN-SIZE ESTIMATES USING MARK-RECAPTURE METHODS 2017-18 SEASON by Mary Claire Kier, John Hileman and Ken Lindke Northern Region Klamath - Trinity Program 601 Locust Street Redding, CA 96001 AUGUST 2018 (THIS PAGE INTENTIONALLY LEFT BLANK) FOREWORD This is the California Department of Fish and Wildlife’s (CDFW) Trinity River Basin Salmon and Steelhead Monitoring Project's twenty-ninth annual report to the United States Bureau of Reclamation (Reclamation). Reported activities were funded by CDFW/Reclamation Cooperative Agreement Number R13AC20027. This report presents work performed on the main stem Trinity River and at Trinity River Hatchery. Necessity for performing our Klamath-Trinity basin monitoring activities are outlined in several Acts of Congress including Public Law 386 (69 Stat. 719), August 12, 1955; Public Law 98-541, October 24, 1984; the “Trinity River Basin Fish and Wildlife Management Reauthorization Act” of 1995; and the Trinity River “Record of Decision”, 2000. ACKNOWLEDGMENTS The CDFW fisheries technicians on whom we relied heavily for the bulk of the field work in the 2017 season include: Michael Bradford, Liv Carter, Chris Hubler, Todd Newhouse, Melissa Reneski, Jane Sartori, Ron Smith, Steven Strite, Ted Tillinghast, and Nathan Keiki Yamasaki. Hoopa Valley Tribal Fisheries (HVTF) performed admirably during the installation and removal of both weirs, once again, and provided Billy Colegrove and Dexter Cooper as technicians to assist throughout weir season. We continue to benefit from our relationship with the HVTF department and appreciate the help we get from everyone who works on our weir installation and pull days. We value the cooperation of the CDFW Trinity River Hatchery staff during recovery efforts, and Doris Chase, Tom O’Gorman, Steve Strite, and the U.S. Forest Service for access, off-season in-basin equipment storage, and general project support. The CDFW monitoring program was approved by the Trinity Management Council (TMC) and funded by Reclamation through the Trinity River Restoration Program (TRRP) office in Weaverville, CA. We thank Caryn Hunt DeCarlo and the TRRP for their contract administration efforts. i Trinity River Basin Salmon and Steelhead Monitoring Project Chinook and Coho Salmon and Fall-Run Steelhead Run-Size Estimates 2017-18 Season (THIS PAGE INTENTIONALLY LEFT BLANK) ii Trinity River Basin Salmon and Steelhead Monitoring Project Chinook and Coho Salmon and Fall-Run Steelhead Run-Size Estimates 2017-18 Season TABLE OF CONTENTS FOREWORD .................................................................................................................... i ACKNOWLEDGMENTS ................................................................................................... i TABLE OF CONTENTS .................................................................................................. iii LIST OF FIGURES .......................................................................................................... iv LIST OF TABLES ............................................................................................................ vi LIST OF APPENDICES ................................................................................................. vii ABSTRACT ..................................................................................................................... 1 INTRODUCTION ............................................................................................................. 3 METHODS ...................................................................................................................... 4 RESULTS ...................................................................................................................... 11 DISCUSSION ................................................................................................................ 36 RECOMMENDATIONS ................................................................................................. 44 LITERATURE CITED .................................................................................................... 45 APPENDICES ............................................................................................................... 48 iii Trinity River Basin Salmon and Steelhead Monitoring Project Chinook and Coho Salmon and Fall-Run Steelhead Run-Size Estimates 2017-18 Season LIST OF FIGURES Figure 1. Location of trapping/tagging weirs near Willow Creek and Junction City, and Trinity River Hatchery, in the Trinity River basin, 2017. ............................................ 5 Figure 2. Photograph of Alaskan-style weir, tripods, support channels, and conduit (looking upstream). Picture taken at Willow Creek weir, 2017. ................................. 6 Figure 3. Typical Junction City weir (JCW) configuration. This shows the weir in afternoon “open” mode, with conduit raised and boat gate removed. ..................... 6 Figure 4. Configuration of Willow Creek weir in 2017. Note the boat gate on the left, with a tunnel leading to the closer of the two traps, and the far side trap mostly submerged. ................................................................................................................... 7 Figure 5. Percent recovery of Junction City weir and Willow Creek weir marked Chinook at Trinity River Hatchery during the 2017-18 season. ...............................................12 Figure 6. Mean catch of spring Chinook Salmon in the Trinity River at Junction City weir, 2017. .............................................................................................................................14 Figure 7. Spring Chinook Salmon fork lengths (cm) observed at Junction City weir, Trinity River Hatchery, and both sites combined during the 2017-18 season.........15 Figure 8. Percent return of Trinity River Hatchery origin, coded-wire tagged, spring Chinook Salmon, brood years 1986-2012. .................................................................18 Figure 9. Hatchery and natural contributions to total spring Chinook run-size, upstream of Junction City weir, 1991 – 2017. .............................................................................19 Figure 10. Mean catch of fall Chinook Salmon in the Trinity River at Willow Creek weir, 2017. .............................................................................................................................21 Figure 11. Fork length frequency distribution of fall Chinook Salmon at Willow Creek weir and Trinity River Hatchery, 2017. ...............................................................................22 Figure 12. Percent return of Trinity River Hatchery origin, coded-wire tagged, fall Chinook Salmon, brood years 1986-2012. ................................................................................25 Figure 13. Hatchery and natural contributions to total fall Chinook Salmon run-size, upstream of Willow Creek weir, 1991 - 2017. .............................................................27 Figure 14. Mean catch of Coho Salmon trapped in the Trinity River at Willow Creek weir, 2017. .............................................................................................................................29 Figure 15. Coho Salmon fork lengths (cm) observed at Willow Creek weir, Trinity River Hatchery and both sites combined during the 2017-18 season. The arrow denotes the size used to separate jacks and adults for analysis. ..........................................30 Figure 16. Mean catch of fall-run steelhead in the Trinity River at Willow Creek weir, 2017. ......................................................................................................................................33 Figure 17. Steelhead fork lengths (cm) observed at Willow Creek weir, Trinity River Hatchery and both sites combined during the 2017-18 season. ..............................34 Figure 18. Total adult escapement, and escapement of natural origin spring Chinook Salmon to the Trinity River above Junction City weir, 2002-2017. ...........................36 Figure 19. Total adult escapement, and escapement of natural origin fall Chinook Salmon to the Trinity River upstream of Willow Creek weir, 2002-2017. .................37 iv Trinity River Basin Salmon and Steelhead Monitoring Project Chinook and Coho Salmon and Fall-Run Steelhead Run-Size Estimates 2017-18 Season Figure 20. Percent of total estimated run-size of fall Chinook Salmon tagged at Willow Creek weir, 2002 – 2017. ..............................................................................................38 Figure 21. Total adult escapement, and escapement of natural origin Coho Salmon to the Trinity River upstream of Willow Creek weir, 2002-2017. .........................................39 Figure 22. Total adult escapement, and escapement of natural origin steelhead to the Trinity River upstream of Willow Creek weir, 2002-2017. .........................................40 v Trinity River Basin Salmon and Steelhead Monitoring
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