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 SIZESIZE DATE OF RETURNDATE OF RETURN RETURNING ADULTS SIZESIZE DATE OF RETURNDATE OF RETURN

MEAN PARENTAL TRAIT OFFSPRING TRAIT

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

H 2 OF FORK LENGTH

Possible Confounding Factors  Steelhead life history is complex  Different ocean years are different environments  Hatchery environment ≠ Natural environment  Influence of environmental variance on h 2 unknown

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

Run Timing ≠ Spawn Timing

CONCLUSIONS  H 2 of adult size ~ 40%  But, may be confounded by environmental variability  H 2 of run timing ~ 85%  Ditto  Future work:  Replication  Comparison between outcomes in hatchery and natural environment