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Comparison of Winter Steelhead Trap Estimates in Small Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites. Erik Suring ODFW. Oregon Coast Steelhead. ODFW Salmonid Life-Cycle Monitoring Project

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Erik Suring ODFW

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Erik suring odfw

Comparison of Winter Steelhead Trap Estimates in Small Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

Erik Suring


Oregon coast steelhead

Oregon Coast Steelhead

  • ODFW Salmonid Life-Cycle Monitoring Project

  • Small basin steelhead returns do not correlate to each other or large scale returns as with coho

  • Determining age structure at multiple life stages allow for survival estimates and local freshwater conditions

Life cycle monitoring project

Life-Cycle Monitoring Project

  • Ten years of adult and smolt data

  • ODFW Habitat Surveys

    • Compare distribution of habitat conditions

Life cycle monitoring project1

Life-Cycle Monitoring Project

  • Seven sites in the OC DPS

  • Non-random selection

  • Representative of DPS based on habitat metrics

  • Coho returns highly correlated with ESU returns

Life cycle data

Life-Cycle Data

Lcm sites

LCM Sites

Lcm basin size

LCM Basin Size

Habitat representativeness

Habitat Representativeness

Habitat representativeness1

Habitat Representativeness

Habitat representativeness2

Habitat Representativeness

Lcm representativeness

LCM Representativeness

Lcm representativeness1

LCM Representativeness

Coho trap to trap

Coho Trap to Trap

Steelhead trap to trap

Steelhead Trap to Trap

Trap to trap correlations

Trap to Trap Correlations

Nested basins

Nested Basins

Coho: R2 = 0.92, p < 0.001

Lcm versus the dps

LCM versus the DPS

  • Relationships between LCM and large scale abundance are not as strong for steelhead as for coho

    • Steelhead numbers have not varied as much as coho over the course of monitoring

  • Weak trap to trap correlations indicate local freshwater conditions play a larger role in steelhead recruitment

Steelhead survival estimates

Steelhead Survival Estimates

  • Monitoring multiple life stages

  • Use scales to track brood year for smolts and adults

    • Estimate marine and freshwater survival rates

  • Currently in our first or second year of adult scale collection

    • Also measure size and timing of smolts and adults

Freshwater survival

Freshwater Survival

  • Single year of smolt scale data applied to all years:

  • Ward and Slaney (1993) Average 0.84%

Marine survival

Marine Survival

  • Smolt and Adult scales at WF Smith

  • Ward and Slaney (1988) Range 7-26%

Freshwater age structure

Freshwater Age Structure

Survival estimates

Survival Estimates

  • Identify factors that affect smolt and adult abundance

    • Look at local variation in survival

    • Reveal trap to trap relationships

  • Other data we should collect?



  • Adult returns to LCM basins do not correlate to larger areas or each other

    • Local freshwater conditions obscure a common ocean signal

  • Describing smolt and adult age structure will allow for survival estimates and reveal differences between LCM sites

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