Survival Estimates for the Passage of Spring-Migrating Juvenile Salmonids through Snake and Columbia River Dams and Reservoirs, 2008.

Faulkner, John; Smith, Steven G.; Muir, William D.

doi:10.2172/962488

Cited by 17 publications

(34 citation statements)

References 28 publications

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“…The 2006 experiment thus provides a directly comparable whole-river survival estimate to those made in the free-flowing Thompson-Fraser system using identical acoustic tags and surgical protocols, as well as allowing a direct comparison of the survival of acoustic-tagged smolts with independent studies of the survival of PIT-tagged Snake River Chinook in the impounded section of the river that were made in the same year ([21]; see Video S1 for a comparison).…”

Section: Introductionmentioning

confidence: 99%

Survival of Migrating Salmon Smolts in Large Rivers With and Without Dams

et al. 2008

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The mortality of salmon smolts during their migration out of freshwater and into the ocean has been difficult to measure. In the Columbia River, which has an extensive network of hydroelectric dams, the decline in abundance of adult salmon returning from the ocean since the late 1970s has been ascribed in large measure to the presence of the dams, although the completion of the hydropower system occurred at the same time as large-scale shifts in ocean climate, as measured by climate indices such as the Pacific Decadal Oscillation. We measured the survival of salmon smolts during their migration to sea using elements of the large-scale acoustic telemetry system, the Pacific Ocean Shelf Tracking (POST) array. Survival measurements using acoustic tags were comparable to those obtained independently using the Passive Integrated Transponder (PIT) tag system, which is operational at Columbia and Snake River dams. Because the technology underlying the POST array works in both freshwater and the ocean, it is therefore possible to extend the measurement of survival to large rivers lacking dams, such as the Fraser, and to also extend the measurement of survival to the lower Columbia River and estuary, where there are no dams. Of particular note, survival during the downstream migration of at least some endangered Columbia and Snake River Chinook and steelhead stocks appears to be as high or higher than that of the same species migrating out of the Fraser River in Canada, which lacks dams. Equally surprising, smolt survival during migration through the hydrosystem, when scaled by either the time or distance migrated, is higher than in the lower Columbia River and estuary where dams are absent. Our results raise important questions regarding the factors that are preventing the recovery of salmon stocks in the Columbia and the future health of stocks in the Fraser River.

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Section: Introductionmentioning

confidence: 99%

Survival of Migrating Salmon Smolts in Large Rivers With and Without Dams

et al. 2008

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“…a In 2008 at these two locations, the PIT data collected did not conform to statistical model assumptions and these estimates are considered problematic or inaccurate [20].…”

Section: Introductionmentioning

confidence: 99%

Survival of seaward-migrating PIT and acoustic-tagged juvenile Chinook salmon in the Snake and Columbia Rivers: an evaluation of length-specific tagging effects

Brown

Oldenburg

Seaburg

et al. 2013

Animal Biotelemetry

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Background: Acoustic telemetry is a widely used tool for evaluating the behavior and survival of juvenile salmonids in the Columbia River basin. Thus, it is important to understand how the surgical tagging process and the presence of a transmitter affect survival. This study evaluated the effect of fish length on the survival of yearling and subyearling Chinook salmon during their seaward migrations through the Snake and Columbia Rivers during 2006, 2007, and 2008. Fish were collected at Lower Granite Dam on the Snake River (695 river km from the mouth of the Columbia) and implanted with either only a passive integrated transponder (PIT) tag (PIT fish) or both a PIT tag and an acoustic transmitter (AT fish). Results: Across the 3 years, a total of 157,000 yearling and subyearling fish were tagged and designated as PIT fish and 18,500 as AT fish. Survival was estimated from release at Lower Granite Dam to multiple downstream dams using the Cormack-Jolly-Seber single release model, and analysis of variance was used to test for differences among length classes for both tag types. No length-specific tag effect was detected between PIT and AT fish (that is, length affected the survival of PIT fish and AT fish in a similar manner). Fish length was positively correlated with the survival of both PIT and AT fish. Survival was markedly low among the smallest length class (that is, 80 mm to 89 mm) of both PIT and AT subyearling Chinook salmon and the survival of PIT fish was generally greater than that of AT fish.

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“…In this study, the hatchery Chinook salmon experienced a survival probability of 0.018 over approximately 50 km. For context, yearling Chinook salmon migrating 500 km through the Snake/Columbia River in the Pacific Northwest, passing through eight hydroelectric projects, have an average survival probability of approximately 0.50 [30]. Numerous mitigation actions including habitat restoration and predator control will be necessary in the San Joaquin River before passage survival reaches acceptable levels.…”

Section: Example: Chinook Salmon Smolts-san Joaquin River Deltamentioning

confidence: 99%

Generation of multistate release–recapture models using a graphic user interface (GUI)

et al. 2016

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Background: Multistate release-recapture models are used to study the movements and survival of animals when multiple migration pathways exist. Model complexity increases exponentially as the number of possible migration pathways increases. Results:Program Branch was developed as freeware to allow users to construct multistate release-recapture models based on a schematic of the study design built with a graphic user interface (GUI). The GUI can be used not only to develop the underlying statistical likelihood models but to direct the estimation of summary performance parameters. Program Branch is illustrated using the spawning behavior of shortnose suckers (Chasmistes brevirostris) in northern California, juvenile Chinook salmon (Oncorhynchus tshawytscha) outmigration through the Sacramento-San Joaquin Delta of California, and adult steelhead (Oncorhynchus mykiss) migration in the Columbia/Snake River Basin in the Pacific Northwest.Conclusions: This software, available online at http://www.cbr.washington.edu/analysis/apps/branch, makes the analysis of complex multistate models easier and allows investigators to review study designs to ensure important model parameters are estimable.

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Survival Estimates for the Passage of Spring-Migrating Juvenile Salmonids through Snake and Columbia River Dams and Reservoirs, 2008.

Cited by 17 publications

References 28 publications

Survival of Migrating Salmon Smolts in Large Rivers With and Without Dams

Survival of Migrating Salmon Smolts in Large Rivers With and Without Dams

Survival of seaward-migrating PIT and acoustic-tagged juvenile Chinook salmon in the Snake and Columbia Rivers: an evaluation of length-specific tagging effects

Generation of multistate release–recapture models using a graphic user interface (GUI)

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