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Smolt Survival and Travel Time and Adult Return Rates for Salmonids in the Snake and Columbia Rivers Update with 2012 Data. Technical Management Team Year-End Review December 5, 2012 Steve Smith [email protected] Northwest Fisheries Science Center NOAA Fisheries. Outline.

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Presentation Transcript
slide1

Smolt Survival and Travel Time and

Adult Return Rates for Salmonids in the

Snake and Columbia Rivers

Update with 2012 Data

Technical Management Team

Year-End Review

December 5, 2012

Steve Smith [email protected]

Northwest Fisheries Science Center

NOAA Fisheries

slide2

Outline

  • Summary of migration conditions, travel time and survival of PIT-tagged smolts through the hydropower system
    • - October 12 Memo; Report to BPA in process
  • Information from return of PIT-tagged adults – transported from and bypassed at Lower Granite
    • - Report to USACE in revision; completion imminent
slide3

Chief Joseph

Wells

GrandCoulee

Rocky Reach

Rock Island

Wanapum

Ice Harbor

Priest Rapids

Lower Granite

Little Goose

Lower Monumental

McNary

John Day

Bonneville

The Dalles

Hells Canyon

Oxbow

Brownlee

PIT-tag Data Sources

Hatchery

Releases

Snake R. trap

Juvenile detectors

Hatchery &

Trap Releases

PIT tag

trawl

slide12

87.1 (93.3)

91.8

93.9

94.0

91.5

92.8

BON

JDA

MCN

LMO

LGO

LGR

SRT

81.7 (90.1)

89.8

87.2

94.2

93.4

94.9

Yearling

Chinook salmon

reach survival

LGR

LGO

LMO

95.2

SRT

99.1

ICE

BON

JDA

TDA

MCN

2012

Mean 02-12

slide13

102.1 (101.0)

81.4

81.1

91.4

95.8

100.1

BON

JDA

MCN

LMO

LGO

LGR

SRT

77.7 (87.8)

83.4

76.0

91.3

93.2

97.1

Steelhead

reach survival

LGR

LGO

LMO

88.2

SRT

92.4

ICE

BON

JDA

TDA

MCN

2012

Mean 02-12

slide20

Conclusions

  • 2009 through 2012 juvenile steelhead survival estimates are the highest in the time series
  • Likely contributing factors include relatively high spill rates and increased migration rate, promoted by additional surface passage structures
  • Residualization is reduced when time in river is reduced
slide21

Preliminary estimates of transport % for 2012 based on PIT-tag data

  • 23% wild Chinook
  • 25% hatchery Chinook
  • 28% wild steelhead
  • 27% hatchery steelhead
slide23

Preliminary estimates of transport %

  • 67% of Chinook and 59% of steelhead passed LGR before transportation began on May 2
  • After transportation started: about 58% of smolts that arrived at LGR were transported
slide24

Conclusions

  • Through direct and indirect effects, recent management actions have:
    • increased number of in-river migrants
    • increased survival of those remaining in-river
      • (esp. steelhead)
    • not necessarily increased smolt-to-adult survival for the population
    • to improve survival to adult for population, in-river increases have to exceed benefit of transport
slide25

Estimating SAR with PIT-tags

  • Estimates of smolt-to-adult return using PIT-tagged fish may be 10%-35% lower than SAR for unmarked fish
  • USFWS study under way at Carson NFH – first adults in 2012
  • NOAA developing proposal to study in Alaska hatcheries
slide26

Estimating Seasonal SAR

  • Need a “time-stamp”
  • We use fish detected at LGR – transported vs. bypassed
  • Relative SAR = “T:B Ratio”
slide28

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

slide29

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

slide30

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

Transported

Bypassed

slide31

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide32

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide33

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide34

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide35

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide36

Transported

Bypassed

Transported

Bypassed

T:B Ratio

T:B

slide41

Conclusion

  • Benefit of transportation was reduced in 2006-2008 relative to earlier years
    • - due to improved conditions for in-river migrants
  • Return rate for transported fishstill exceeded that for in-river migrants for most of the season
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