Hatchery Production Wells Hatchery Steelhead: 450,000 fish annually

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Presentation transcript:

Ecologic and Demographic Costs of Releasing Non-migratory Juvenile Hatchery Steelhead

Hatchery Production Wells Hatchery Steelhead: 450,000 fish annually USACOE tagged 240,000 in three consecutive years 2002-2004 broods Monitored releases to recapture PIT tags by truckload.

Natural Production This is combined data for the Methow and Okanogan populations.

Study Objectives Can a volitional release be used to efficiently segregate migrant and non-migrant fish? What is the “cost” of releasing non-migrant fish?

Wells Hatchery

Methods Release monitoring: Separate estimate of PIT tag rate per truckload Residual sampling-Twisp River: Captured fish expanded by PIT tag rate Survival estimates-all releases: Release to Residual (juvenile) Release to McNary Dam (juvenile) Release to Bonneville Dam (adult) Release to Wells Dam (adult)

Twisp River Releases Brood year Volitional migrants Non-migrants Non-migrants Truckloads PIT tags Total fish 2002 5 25,211 45,180 4 30,813 50,210 2003 24,566 51,220 2 9,401 26,085 2004 6 24,379 52,245 3 10,886 23,310 Total 16 74,156 148,645 9 51,100 99,605

Residual sampling Hook and line angling July-August Recaptured 792 PIT tagged fish Release type determined for 515 fish

Estimated number (% of release type) Results Brood Migration type Number captured Estimated number (% of release type) G P 2003 2004 2005 Total 2002 Volitional 21 3 1 25 36 (0.08) 177.5 <0.005 Non-migrant 159 163 269 (0.54) 13 14 29 (0.06) 108.7 34 103 (0.39) 50 122 (0.23) 623.46 229 486 (2.08) 180 53 282 515 1,045

Mean % recovered (95% CI) by release type in the Twisp River Mean of the total recoveries by release type for each brood. Twisp River only.

Adult survival 2002-04 brood PIT tagged fish released by type and subbasin. Volitional Non-migrant Total Twisp 74,156 51,100 125,256 Chewuch 86,729 13,985 100,714 Methow 99,848 15,510 115,358 Okanogan 109,920 19,402 129,322 370,653 99,997 470,650 Used all releases to calculate adult survival.

Mean survival (%; 95% CI) from release to McNary Dam Cormak Jolly Seber survival estimates calculated by Townsend and Skalski at UW for PUD. Releases in all basins combined by brood and type.

Mean SAR (%; 95% CI) from release to Bonneville Dam 3-year mean % survival for all releases. Used Bonneville to eliminate confounding effects of selective fisheries. Vol = 1.18%, NM = .26%

Conclusions Volitional releases produce 0.10 residuals per adult Non-migrant releases produce 1.8 residuals per adult Properly conducted volitional release from Wells Hatchery would result in: Not releasing 10% of juvenile steelhead population (i.e., non-migrants) Non-migrant hatchery steelhead would enhance or replace some rainbow trout production Wells Hatchery would produce 3.1% fewer adult returns to Wells Dam Would not adversely impact recreational fisheries Assist in reducing pHOS Reduce residualism in the natural environment by 35.7%. Reduction in competition would increase juvenile survival

Questions?