hatchery and wild salmon in the columbia river estuary ......• habitat use similar between...
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Hatchery and wild salmon in the Columbia River estuary
--similar or different?
Laurie WeitkampNorthwest Fisheries Science Center
Newport Field Station
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Talk outline
• Background: Columbia River hatchery and wild salmon production and issues
• Methods: H vs. W, geographic origins, studies
• Results: General patterns of juvenile salmon useHatchery and wild salmon comparisons– Habitat use– Relative abundance– Timing & size– Food habits
• Summary & Conclusions
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Why salmon hatcheries?
50-90% mortality
5-10% mortality
• Hatcheries bypass high egg incubation and early rearing mortality- Often started as compensation for habitat loss, declining
fish runs• Currently support most fisheries
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• First Columbia River hatchery started 1872 – in response to declining Chinook runs
• Peak production 1988: 250 million salmon= 9.8 million pounds
• Currently 140 million from >70 facilities– 70 million fall Chinook– 31 million spring Chinook– 23 million coho– 15 million steelhead
• Failed to restore salmon runs to historical levels
Columbia River salmon hatcheries
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Concerns about hatchery salmonPotential impacts to wild populations:
Competition for food & space
Predation (attract predators, prey on wild fish)
Disease transmission
Genetic effects if interbreeding
Hatchery harvest rates too high for wild populations
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• 13 groups listed under the U.S. Endangered Species Act– 5 Chinook, 5 steelhead, 1 ea. sockeye, chum, coho
• Huge effort underway on restore wild salmon through habitat restoration, dam passage improvements, predator controls, fishery restrictions, etc.
• Uncertain impacts of hatchery fish on wild salmon, especially where opportunities to mix:– river corridors– estuaries– marine waters
Concerns about wild Columbia R salmon
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What do we know about H & W salmon in the Columbia Estuary?
Similar or different with respect to:– Habitat use– Relative abundance– Size & timing– Food habits
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Challenge: telling hatchery from wild fish
Adipose fin clips• Clipped = hatchery• Unclipped= hatchery + wild
Tags (have “rearing type” field)• CWT (most H)• PIT (some H or ?)
Genetics• Not informative
Hatchery clip rates
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Estuary sampling methods
Purse seines in deep water, beach seine in shallow water
Columbia River estuary
Beach seine site
Purse seine
Beach seine
Purse seine
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Purse seine Beach seine
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General patterns of juvenile salmon in the Columbia River estuary
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Yearling Chinook Coho
SteelheadSubyearling Chinook
Juvenile salmon abundance (PS)
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Subyearling ChinookYearling ChinookChumCohoCutthroat troutSteelheadSockeye
Beach SeineN = 8475
Purse SeineN = 1731
Juvenile salmon habitat use
SubyrChinook
SubyrChinookChum
YrChinook
YrChinook
Coho
Steel-head
Coho Sockeye
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Shallow Water Beach Seine Deep Water Purse Seine
April – June July - October April – June July ‐ October
Graphics: D Teel
Genetic stock composition of Chinook salmon
Spr Cr
W Cascfall
W Cascfall W Casc
fall
UCR su/fa 0UCR su/fa 1 UCR
su/fa 0
Spr Cr
Snake
Will sprW Casc spr
M&UCR sp
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Hatchery-wild comparisons
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Purse seine H-W relative abundance
Attribute\Spp.Yr
ChinookSubyr.
Chinook CohoSteel-head
Hatch. production (millions) 32.7 69.5 21.9 15.1
% ad clipped at hatchery 91.1 75.7 68.6 84.9
% ad clipped in estuary 86.2 65.8 75.4 77.8
Estimated % hatchery in purse seine catches
94.7 85.8 98.7* 91.6
* Capped at 100% 2007-2009
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Hatchery-wild relative abundance
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Size differences: H vs. wild salmon
Hatchery > wildHatchery = wild
Hatchery > wildHatchery = wild
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0 30 60 90 120 150 180 210 240 270 300 330 360
50
100
150
200
Day of year0 30 60 90 120 150 180 210 240 270 300 330 360
Fork
Len
gth
50
100
150
200
0 30 60 90 120 150 180 210 240 270 300 330 360
50
100
150
200
Day of year0 30 60 90 120 150 180 210 240 270 300 330 360
Fork
Len
gth
50
100
150
200
Beach seine - MarkedBeach seine - UnmarkedPurse seine - MarkedPurse seine - Unmarked
Hatchery-wild subyr. Chinook size
Larger fish in deeper (PS) than shallow water (BS)Big size difference between marked & unmarked in shallow
water (BS) but not deep water (PS)
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Length in estuary
Date in estuary
Yr. Chinook timing and size
M & UCR spr
Snake fall 1
Snake spr
U CR su/fa
1
W Cascspr
Willa-matte
spr
W Cascspr
Willa-matte
spr
M & UCR spr
Snake fall 1 Snake
spr
U CR su/fa
1
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Length in estuary
Date in estuary
Subyr. Chinook timing and size
W Cascfall
SprCr fall
Snake fall 0
U CR su/fa
0
W Cascfall
SprCr fall
Snake fall 0
U CR su/fa
0
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Subyr. Chinook size & time in estuary (GSI)
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Length in estuary
Date in estuary
Subyr. Chinook timing and size
W Cascfall
SprCr fall
Snake fall 0
U CR su/fa
0
W Cascfall
SprCr fall
Snake fall 0
U CR su/fa
0
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Steelhead timing and sizeLOCR MCR UCR SNAKE WILL
Length in estuary
Date in estuary
Dark bars: HatcheryLight bars: Unclipped
(=H+W)LOCR
MCR UCR SNAKE
WILL
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Prey consumed by H-W salmon
U=unmarked, M=marked
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Summary
• Majority (>70%) of juv. salmon in CR estuary are of hatchery origin– <100% hatchery marking = difficult to tell hatchery from wild
• Habitat use similar between Hatchery and wild salmon– H & W coho, yr. Chinook, and steelhead in deep water habitats– Slightly more wild than hatchery subyearling Chinook in shallow water
• Hatchery fish generally larger than unmarked fish (esp. steelhead)– exception: subyearling Chinook salmon (timing = size)
• Timing similar between H & W salmon (~1 week)• exception: wild subyr Chinook salmon 2-4 weeks later than hatchery
• Diet overlap appears to be high among and within groups– No evidence that H steelhead consuming wild salmon (subyr Chinook or chum)
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Conclusions
• High potential for competition between hatchery and wild salmon (within and among species) in estuaries– Occupying same habitats at same times (ex. subyr Chinook)– Consuming same prey types
• Also potential for direct behavioral interactions– Larger hatchery fish may have size advantage
• 100% mark rates for hatchery fish would greatly improve ability to make comparisons
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Questions?
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Clip rates by group (% clipped)Yearling Chinook Coho
SteelheadSubyearling Chinook
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Bias from fish origin methodEx. Steelhead origins
GSI CWT
n=468 n=59
PIT tags
n=22
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Geographic origins of Columbia salmon
Genetics
ChinookSteelhead
Coded wiretags (CWT)
PIT tags
CohoChinookSteelhead
[Coho]ChinookSteelhead
Everything “tagged”
CR coho mush24 mil tagged
(h)2 mil tagged
(h & w)Bias: UCR & Snake