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Life History of Bull Trout of the Upper Mid-Columbia Basin

Life History of Bull Trout of the Upper Mid-Columbia Basin. Mark C. Nelson – USFWS John Crandall – Methow Restoration Council. This is a bull trout. This is not. But what about Dolly Varden?. Listed as federally threatened (1999) Draft USFWS Recovery Plan (2002)

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Life History of Bull Trout of the Upper Mid-Columbia Basin

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  1. Life History of Bull Trout of the Upper Mid-Columbia Basin • Mark C. Nelson – USFWS • John Crandall – Methow Restoration Council

  2. This is a bull trout This is not

  3. But what about Dolly Varden?

  4. Listed as federally threatened (1999) • Draft USFWS Recovery Plan (2002) • UC Salmon Recovery Plan (2007) • Critical Habitat designation (2010) Goal of recovery is to ensure long-term persistence of self-sustaining, complex, interacting groups of bull trout Behnke 2002

  5. “Viable Bull Trout Population” (VBTP) Factors • Number of local populations • Adult abundance • Productivity (population growth rate) • Connectivity • Similar, but not identical to: • Viable Salmonid Population (VSP) Parameters • Abundance, Productivity, Spatial Structure, Diversity

  6. Recovery Unit Core Area Biologically functioning unit Local Populations Interacting reproductive unit Extirpated from Okanogan River and Lake Chelan

  7. Methow Wenatchee Entiat Local population designations do not include all critical habitat

  8. Diverse Life History • Resident • Migratory • -- Fluvial • -- Adfluvial • -- Anadromous (not in Upper Columbia)

  9. Resident bull trout are relatively small compared to migratory bull trout Mature at 200cm and 4 years old

  10. Migrants can be quite large and travel long distances annually Mature at 4-6 years and 300mm

  11. Migrants in the UC • Generally: • Upstream June - August • Spawn mid Sep- mid Oct • Down migrate post-spawn • Residents in the UC • Generally: • Spawn mid Sep-mid Oct • Short instream movements

  12. Incubation = 210 days

  13. Migrant redds are large and obvious

  14. Resident redds are highly variable in size, shape and composition 16 inches

  15. Relatively intact spawning areas with high water quality Temp <15 °C, spawning 4-9 °C

  16. Mainstem habitat use in pools, deeper glides and along banks

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