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Survival Estimates for the Passage of Juvenile Salmonids Through Dams and Reservoirs of the Lower Snake and Columbia Rivers (Project 199302900) CBFWA March.

Published byAutumn Coffey Modified over 11 years ago

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Presentation on theme: "Survival Estimates for the Passage of Juvenile Salmonids Through Dams and Reservoirs of the Lower Snake and Columbia Rivers (Project 199302900) CBFWA March."— Presentation transcript:

1 Survival Estimates for the Passage of Juvenile Salmonids Through Dams and Reservoirs of the Lower Snake and Columbia Rivers (Project 199302900) CBFWA March 28-29, 2006 steven.g.smith@noaa.gov

2 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers

3 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers Operate the PIT tag trawl in the Columbia River estuary

4 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers Operate the PIT tag trawl in the Columbia River estuary Evaluate adult returns of PIT-tagged fish

5 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers Operate the PIT tag trawl in the Columbia River estuary Evaluate adult returns of PIT-tagged fish

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7 Bonneville The Dalles John Day Hells Canyon Oxbow Brownlee Priest Rapids Wanapum Rock Island Rocky Reach Wells Chief Joseph Grand Coulee McNary Ice Harbor Little Goose Lower Granite Lower Monumental Estuary recoveries Juvenile detectors

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11 Lower Granite tagging (each year) About 20,000 hatchery steelhead Up to 10,000 wild steelhead Up to 10,000 wild yearling Chinook Combined with fish tagged above LGR

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14 Bonneville The Dalles John Day Hells Canyon Oxbow Brownlee Priest Rapids Wanapum Rock Island Rocky Reach Wells McNary Ice Harbor Little Goose Lower Granite Lower Monumental Crescent Island

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16 4 to 21% of all PIT-tagged steelhead leaving Lower Monumental Dam found on Crescent Island, 1998-2005

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20 Use of survival data Reach survival data used to evaluate structural and operational changes in the hydropower system and to determine where additional improvements are needed

21 Use of survival data Reach survival data used to evaluate structural and operational changes in the hydropower system and to determine where additional improvements are needed Survival estimates used to determine whether BiOp hydropower performance standards are met each year

22 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers Operate the PIT tag trawl in the Columbia River estuary Evaluate adult returns of PIT-tagged fish

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25 Yearling Chinook Salmon Survival McNary to Bonneville

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27 Use of trawl data Used to determine smolt arrival timing to the estuary

28 Use of trawl data Used to determine smolt arrival timing to the estuary Used to compare performance of different groups (i.e., transport vs inriver)

29 Use of trawl data Used to determine smolt arrival timing to the estuary Used to compare performance of different groups (i.e., transport vs inriver) Used as final PIT tag recapture site, necessary for survival estimation to the tailrace of Bonneville Dam

30 Objectives Provide estimates of survival for juvenile salmonids migrating through the Snake and Columbia Rivers Operate the PIT tag trawl in the Columbia River estuary Evaluate adult returns of PIT-tagged fish

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38 Use of SAR data To evaluate migration strategies (multiple bypass, transport vs spill, etc.)

39 Use of SAR data To evaluate migration strategies (multiple bypass, transport vs spill, etc.) Hydropower system mortalitys role in life cycle mortality

40 Major findings

41 Stream type Chinook survival has averaged 62% from hatchery release to the first dam

42 Major findings Stream type Chinook survival has averaged 62% from hatchery release to the first dam Reach survival has averaged 90% per project for Chinook and 85% for steelhead

43 Major findings Stream type Chinook survival has averaged 62% from hatchery release to the first dam Reach survival has averaged 90% per project for Chinook and 85% for steelhead Hydropower system survival has averaged 46% for Chinook and 32% for steelhead

44 Major findings Stream type Chinook survival has averaged 62% from hatchery release to the first dam Reach survival has averaged 90% per project for Chinook and 85% for steelhead Hydropower system survival has averaged 46% for Chinook and 32% for steelhead Migrant survival only weakly related to SAR, ocean entry timing appears important

45 Publications 18 reports to BPA (available on BPA website) 11 peer-reviewed publications

46 Questions

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