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Natural Reproductive Success of First-generation Hatchery Steelhead Spawning in the Kalama River

Natural Reproductive Success of First-generation Hatchery Steelhead Spawning in the Kalama River. CAMERON SHARPE PAT HULETT CHRIS WAGEMANN MAUREEN SMALL WDFW KALAMA RESEARCH TEAM & CONSERVATION BIOLOGY UNIT. ACKNOWLEDGEMENTS. KALAMA HATCHERY STAFF NOAA/MITCHELL ACT

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Natural Reproductive Success of First-generation Hatchery Steelhead Spawning in the Kalama River

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  1. Natural Reproductive Success of First-generation Hatchery Steelhead Spawning in the Kalama River CAMERON SHARPE PAT HULETT CHRIS WAGEMANN MAUREEN SMALL WDFW KALAMA RESEARCH TEAM & CONSERVATION BIOLOGY UNIT

  2. ACKNOWLEDGEMENTS • KALAMA HATCHERY STAFF • NOAA/MITCHELL ACT • ANNE MARSHALL, HOWARD FUSS, TODD PEARSONS, BILL HOPLEY, STEVE LEIDER

  3. KALAMA WILD BROODSTOCK PROGRAM

  4. CURTAIN OF DENIAL

  5. THE BROODSTOCK • SELECTED TO REPRESENT PHENOTYPIC DIVERSITY OF THE WILD STOCK • RUN TIMING (NOT SPAWN TIMING) • ADULT SIZE (NOT AGE STRUCTURE) • Probably an adequate proxy

  6. ‘98 ‘99 ‘00 ‘98 ‘99 ‘00

  7. THE RETURNING ADULTS • WILD- & HATCHERY-ORIGIN PASSED UPSTREAM • HATCHERY FISH SELECTED TO MATCH THAT YEAR’S RETURNING WILD FISH • ABUNDANCE/TIME – 50:50 H:W • SEX RATIO – MATCHED H:W • NON-SELECTIVE FOR SIZE

  8. ‘02 ‘03 ‘04 ‘02 ‘03 ‘04

  9. H1W3 H1 H2 H3 H4 H1H4 W1 W2 X W2W3 W3 W4 IDEALLY: SPAWNERS OFFSPRING

  10. REALITY: SPAWNERS OFFSPRING H1 H2 U3W3 H4 H3 H1W3 X H1 U4 W1 W2 W4 W3 U2H4 X U1W3 U1 U2 W2W3 U4 U3

  11. POTENTIAL SPAWNERS • WILD ANADROMOUS • F1 HATCHERY ANADROMOUS • RESIDUAL HATCHERY • RESIDENT TROUT • ALL ONLY PARTIALLY SCREENED

  12. SMOLT LG RESIDUAL SM RESIDUAL

  13. MIGRANTS & RESIDUALS (BY ’00 & BY ’99) MIGRANTS FREQUENCY RESIDUALS FORK LENGTH (mm)

  14. RESIDUALS • NUMEROUS • WELL-DISTRIBUTED • PERSISTANT • MOSTLY MALE • MOSTLY MATURE OR MATURING

  15. 2005 RESIDUALS SAMPLED

  16. RESIDENT • A FISH THAT DOESN’T ADOPT ANADROMY. EVER.

  17. RESIDENT TROUT

  18. THE PARENT POOL • SCREENED HATCHERY • SCREENED WILD • RESIDENTS • RESIDUALS

  19. PRELIMINARY: 1ST TWO REPS

  20. AN ODDITY

  21. WILD RESIDENT TROUT Offspring from Residents: 19 from 15 (single) parents

  22. RESIDUAL HATCHERY FISH Offspring from Residual Hatchery Steelhead: Zero, Zip, Bupkis

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