life history of bull trout of the upper mid-columbia basin
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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)•UC Salmon Recovery Plan (2007)•Critical Habitat designation (2010)
Behnke 2002
Goal of recovery is to ensure long-term persistence of self-sustaining, complex,
interacting groups of bull trout
“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) ParametersAbundance, Productivity, Spatial Structure, Diversity
Wells Dam
Wanapum Dam
Rocky Reach Dam
Rock Island Dam
Chief Joseph Dam
0 30 6015Kilometers
Methow Core Area
Entiat Core Area
Wenatchee Core Area
Lake Chelan
Hydroelectric Dam
Colum
bia R
iver
Recovery Unit
Core AreaBiologically functioning unit
Local PopulationsInteracting reproductive unit
Extirpated from Okanogan River and
Lake Chelan
Wenatchee River
I cicle Creek
0 10 205Kilometers
Local Populations of Bull Trout in the Wenatchee Core Area
Columbia River
Chiwaukum Creek
Icicle Creek
Nason Creek
Peshastin Creek
Little Wenatchee River
White River
Chiwawa River
Rock Island Dam
Rocky Reach Dam
0 6 123Kilometers
Local Populations of Bull Trout in the Entiat Core Area
Mad River
Entiat River
Mad River
Entiat River
Colu
mbi
a Ri
ver
0 8 164Kilometers
West Fork Methow River
Lost River
Early Winters Creek
Wolf Creek
Twisp River
Gold Creek
Beaver Creek
Goat Creek
Chewuch River
Local Populations of Bull Trout in the Methow Core Area
Wenatchee
Entiat
Methow
Local population designations do not include all critical habitat
Diverse Life History•Resident•Migratory
-- Fluvial-- Adfluvial-- Anadromous (not in Upper Columbia)
Resident bull trout are relatively small compared to migratory bull troutMature at 200cm and 4 years old
Migrants can be quite large and travel long distances annuallyMature at 4-6 years and 300mm
Migrants in the UCGenerally:• Upstream June - August• Spawn mid Sep- mid Oct• Down migrate post-spawn
Residents in the UCGenerally:• Spawn mid Sep-mid Oct• Short instream movements
1-Jan 20-Feb 11-Apr 31-May 20-Jul 8-Sep 28-Oct 17-Dec0
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Twisp River Bull TroutLifecycle Timing and Flows
Mean Median Maximum Minimum Bull Trout
Upstream Migration Juvenile Rearing Multiple Age Classes Present
Downstream Migration
Spawning
Incubation = 210 days
Migrant redds are large and obvious
16 inches
Resident redds are highly variable in size, shape and
composition
Relatively intact spawning areas with high water quality
Temp <15 °C, spawning 4-9 °C
Mainstem habitat use in pools, deeper glides and along banks
