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Heritability of Run-Timing and Adult Size in Kalama Summer Steelhead

Heritability of Run-Timing and Adult Size in Kalama Summer Steelhead. Cameron Sharpe, Pat Hulett, Chris Wagemann, and Maureen Small. WDFW. ACKNOWLEDGEMENTS. KALAMA HATCHERY STAFF WDFW DNA LAB STAFF NOAA-FISHERIES/MITCHELL ACT. WILD BROODSTOCK. RETURNING ADULTS. SIZE DATE OF RETURN. SIZE

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Heritability of Run-Timing and Adult Size in Kalama Summer Steelhead

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  1. Heritability of Run-Timing and Adult Size in Kalama Summer Steelhead Cameron Sharpe, Pat Hulett, Chris Wagemann, and Maureen Small WDFW

  2. ACKNOWLEDGEMENTS • KALAMA HATCHERY STAFF • WDFW DNA LAB STAFF • NOAA-FISHERIES/MITCHELL ACT

  3. WILD BROODSTOCK RETURNING ADULTS SIZE DATE OF RETURN SIZE DATE OF RETURN

  4. OFFSPRING TRAIT MEAN PARENTAL TRAIT OFFSPRING TRAIT MEAN PARENTAL TRAIT

  5. Part 1: Heritability of Adult Size • Recorded fork length at the time the fish were captured in our trap at Kalama Falls Hatchery. • For size at age issues, parent’s ages from scale analysis, offspring’s ages inferred from pedigrees

  6. H2 OF FORK LENGTH

  7. Possible Confounding Factors • Steelhead life history is complex • Different ocean years are different environments • Hatchery environment ≠ Natural environment • Influence of environmental variance on h2 unknown

  8. Part 2: Heritability of Run-Timing • Summer-run steelhead return in the summer and fall of the year BEFORE they spawn • Date of return was recorded for wild parents and their hatchery offspring

  9. Run Timing ≠ Spawn Timing

  10. CONCLUSIONS • H2 of adult size ~ 40% • But, may be confounded by environmental variability • H2 of run timing ~ 85% • Ditto • Future work: • Replication • Comparison between outcomes in hatchery and natural environment

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