Cutthroat Trout As Successful Urbanites · 2005. 10. 21. · Bingham Creek Smolt Production Coho,...
Transcript of Cutthroat Trout As Successful Urbanites · 2005. 10. 21. · Bingham Creek Smolt Production Coho,...
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Cutthroat TroutAs Successful Urbanites
Dave Seiler, Laurie Peterson & John SerlWashington Department of Fish & Wildlife
Roger TaborUS Fish & Wildlife Service
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Location of Trap Sites: Cedar River & Bear Creek
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Coho adult
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Coho fry
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Big Beef Creek upstream/downstream migrant trap
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Bingham Creek downstream migrant trap
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Skagit River screw & scoop traps, near Mt Vernon
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Cedar River Screw Trap
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Big Bear Creek Screw Trap
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Thornton Creek fence trap
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Big Beef Creek Smolt ProductionCoho, Cutthroat & Steelhead 1978-2004
0
10,000
20,000
30,000
40,000
50,000
1978 1981 1984 1987 1990 1993 1996 1999 2002
Smolt Year (i+1)
Smol
t Pro
duct
ion
CohoCutthroatSteelhead
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Bingham Creek Smolt ProductionCoho, Cutthroat & Steelhead 1982-2004
0
20,000
40,000
60,000
80,000
1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
Smolt Year (i+1)
Smol
t Pro
duct
ion
CohoCutthroatSteelhead
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Flow Comparison of Two Lake Washington Tributaries
Mercer Creek & Rock Creek, 2005
0
20
40
60
80
100
120
140
160
180
Feb Mar Apr May Jun
Date
Flow
(cfs
)
Mercer Cr (46% TIA)Rock Cr (9% TIA)
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Outmigrant Population Ratios forWestern Washington Streams & %TIA
1385Average
CutthroatSteelheadCohoNumberSpan
60132000-200251%Thornton Creek
10112000>15%Issaquah Creek
10761999-200415%Big Bear Creek
111561999-2004~5%Cedar River
Now
138131976-1978LowNorth Creek
128831976-1978LowLittle Bear Creek
Then
Lake Washington Tributaries
18833552000-2004~5%Green River
1327151990-2004<5%Skagit River
17265231982-2004<5%Bingham Creek
1236271978-20045%Big Beef Creek
RatiosTrapping Years%TIAStream
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Average Density of Juvenile Cutthroat & Cohoin Six Lake Washington Streams
Summer 1993 & 2003
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1993 2003
Sampling Year
Den
sity
(fis
h/m
2)
CutthroatCoho
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Purse-Seining in Ballard Locks
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In-River Survival of Hatchery Sockeye FryReleased at Landsburg Hatchery, Cedar River 1995
0%
25%
50%
75%
100%
0 500 1000 1500 2000 2500 3000 3500
Flow (cfs)
Surv
ival
Rat
e
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Bear Creek Egg-to-Fry Survival & Migration Flow (Feb1 thru Mar31)
2000
1997
19992003
2002
1998
2001
1996Ice Storm
R2 = 63%
0%
5%
10%
15%
20%
25%
50 100 150 200
Average Flow (cfs)
Surv
ival
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Gut Content Analysis of PredatorsBear Creek: March 14, 2001
17847Torrent Sculpin
2817910>150711211< 150
Cutthroat
49916Coho 1+
#Fresh fry/ Gut
Average Size (mm)
Number SampledSpecies
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Cutthroat Trout
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Rainbow trout
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Cutthroat photo
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Cutthroat Trout Captured in Lake Washington Coho Gillnet Fishery, October 2004
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Cutthroat Trout Captured in Lake Washington Coho Gillnet Fishery, October 2004
Size range of fish above – 55-59cm FKL; two 4 yr. olds, one 3 yr. old
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Size at Age of Cutthroat CapturedLake Washington Gillnet Fishery 2004
0
10
20
30
40
50
60
70
1+ 2+ 3+ 4+ 5+
Age
Len
gth
(mm
)
Average
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Lake Washington Cutthroat SamplingGut-Content Analysis
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Gut Contents of Large Cutthroat
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Sok Keo with 14.9 lb cutthroat he caught in Lake Washington, August 2002