Relative reproductive success of hatchery and wild steelhead in the Hood River

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Relative reproductive success of hatchery and
wild steelhead in the Hood River

• Dept. Zoology
• Oregon State University

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Supplementation of wild populations
left in wild
Wild fish
taken into hatchery
H
H
H
H
Demographic boost two generations later
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Supplementation assumes fitness of H fish similar
to W
left in wild
Wild fish
taken into hatchery
H
H
?
H
H
Big question fitness of H fish after one
generation through hatchery?
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Steelhead (Oncorhynchus mykiss) in the Hood
River, Oregon
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Powerdale dam
Winter-run Egg-laying site
Summer-run Egg-laying site
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dang
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(No Transcript)
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Hood River Steelhead
Stock History Winter run Old Big Creek stock
(Hold) phased out in 1991 Supplementation
hatchery (Hnew) program began, first releases in
1992 Summer run Old Skamania stock phased out
in 1997 (Hold) Supplementation hatchery program
(Hnew) first releases in 1998
Note all hatchery fish are marked with a
stock-specific fin clip before release
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Example winter run
Hnew parental generation released in 92.
Returned to spawn in the wild mostly in 95 and
96.
                                           
 
 
31
H
64
2
91-92
92-93
97-98
96-97
95-96
94-95
93-94
00-01
99-00
98-99
02-03
01-02
5
61
First generation of Hnew conservation hatchery
fish created.  
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4
F1 offspring of the 185 Hnew and 276 W parents
that Potentially spawned in the 95 run year

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Winter run
New hatchery program begun in 92. Old stock
phased out.
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Summer run
New hatchery program begun in 97. Old stock
phased out.
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Comparisons Winter Run 1991 Hold vs.
wild 1995 Hnew vs. wild 1996 Hnew vs.
wild 1997 Hnew vs. wild Summer Run 1995
Hold vs. wild 1996 Hold vs. wild
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Whos your daddy?
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Typed 97.2 of all fish passed 8 microsatellite
loci Highly polymorphic (Na 40.6, He
0.92) Pure exclusion with no mismatches
allowed Relative reprod. success (RRS)
mean offspr. assigned per H adult mean
offspr. assigned per W adult correction for
bias see Araki and Blouin (2005) Molecular
Ecology
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Frequency distribution of number of offspring
Traditional hatchery v.s. Wild (Winter91)
Male
Female
Freq.
Freq.
Noffspring
Noffspring
New hatchery v.s. Wild (Winter96)
Male
Female
Freq.
Freq.
Noffspring
Noffspring
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Traditional hatchery v.s. Wild
Run-Year RRSH/W-Male RRSH/W-Female Summer
95 0.31 0.33 Summer96 0.30 0.28
Average 0.30 0.30 Winter91 0.06 0.1
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New hatchery v.s. Wild
Run-Year RRSH/W-Male RRSH/W-Female Winter
95 0.67 0.77 Winter96 1.05 0.93 Winter9
7 0.85 1.26 Average 0.87 0.98
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Summary Hold summers 30 fitness of wild
fish Hold winters 6-11 fitness of wild
fish Hnew winters 67-126 (avg. 86-98)
fitness of wild fish
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Summary Hold summers 30 fitness of wild
fish Hold winters 6-11 fitness of wild
fish Hnew winters 67-126 (avg. 86-98)
fitness of wild fish Angling correction Hold
summers 40 fitness of wild fish Hold winters
6-11 fitness of wild fish Hnew winters
71-156 (avg. 106-118) fitness of wild fish
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Success of Hood River supplementation program?
0.85X
H
H
Taken into hatchery
H
5-10X
H
H
H
H
H
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Supplementation a good idea? Ecological
issues Effective size When do you stop?
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Decline in fitness with generations through
hatchery
steelhead (this study)
steelhead
Atlantic salmon (farmed)
steelhead
steelhead
Brown trout
From Travis et al., 2004. Salmon Recovery
Science Review Panel Report for
NMFS http//www.nwfsc.noaa.gov/trt/rsrp.htm
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Future work Effects of incorporating Hnew into
broodstock (i.e. effects of more than one
generation through hatchery)?
                                                 
4
29
61
6
91-92
92-93
97-98
96-97
95-96
94-95
93-94
00-01
99-00
98-99
02-03
01-02
08-09
07-08
06-07
05-06
03-04
04-05
09-10
Returning Hnew adults mixed with wild broodstock
in Hatchery beginning in 1995
 
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Funding BPA ODFW
Acknowledgements Hitoshi Araki Bill Ardren Becky
Cooper Charles Criscione Rod French Kathryn
Kostow ODFW Staff at Powerdale Dam Erik
Olsen Ruben Van Dam