Technology developed for diverting passive integrated transponder (PIT) tagged fish at hydroelectric dams in the Columbia River Basin

Downing, Sandra L.; Prentice, Earl F.; Frazier, Richard W.; Simonson, James E.; Nunnallee, Edmund P.

doi:10.1016/s0144-8609(01)00079-6

Cited by 25 publications

(21 citation statements)

References 14 publications

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“…After detection at Lower Granite Dam, the PIT-tagged fish were routed by gates (Marsh et al 1999) back to the river. We used a diversion device (Downing et al 2001) located in the juvenile fish bypass system of Little Goose Dam to recapture a presumably random sample of the detected PIT-tagged fish. We scanned each recaptured fish for the PIT tag code and then measured fork length.…”

Section: Methodsmentioning

confidence: 99%

Postrelease Performance of Hatchery Yearling and Subyearling Fall Chinook Salmon Released into the Snake River

Connor

Smith

Andersen

et al. 2004

N American J Fish Manag

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Two rearing treatments are used at Lyons Ferry Hatchery to produce yearling (age‐1) and subyearling (age‐0) fall Chinook salmon Oncorhynchus tshawytscha for supplementing production of wild fish in the Snake River. We compared four indicators of yearling and subyearling postrelease performance, namely, seaward movement, condition factor, growth rate, and survival. A standard rearing treatment was used to grow yearlings slowly for 14 months to sizes of 152–162 mm (mean fork length). A second standard rearing treatment was used to grow medium subyearlings at a moderate rate for 5 months to 84–89 mm. Two modified rearing treatments were used to produce large subyearlings that were grown rapidly to 90–103 mm and small subyearlings that were grown slowly to 70–76 mm. We released yearlings in April and subyearlings in June on the typical supplementation schedule. Seaward movement, condition factor, growth, and survival varied among rearing treatments. Yearlings moved seaward fastest for reasons related to their large size. Yearlings had the lowest postrelease condition factors and growth rates because they were released when temperatures were cool and they moved seaward quickly, spending little time to feed. Yearlings had the highest survival because they were released when the water was cool, they moved seaward quickly, and their large size reduced susceptibility to predation. Small subyearlings moved seaward the slowest because of their small size and slow growth before release. Small subyearlings had the highest postrelease condition factors and highest growth rates because they lingered and were exposed to relatively high temperatures that were favorable for growth. Small subyearlings had the lowest survival because they lingered and were exposed to low flow and warm water for long durations and their small size increased susceptibility to predation. We conclude that fall Chinook salmon performance after release from Lyons Ferry Hatchery is influenced by release date and by rearing treatment effects on size, prerelease growth rate, and postrelease behavior.

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Section: Methodsmentioning

confidence: 99%

Postrelease Performance of Hatchery Yearling and Subyearling Fall Chinook Salmon Released into the Snake River

Connor

Smith

Andersen

et al. 2004

N American J Fish Manag

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“…; Downing et al. ) at Lower Granite Dam for comparison. As in 2011, we also collected fish from the forebay of the dam during October and November.…”

Section: Methodsmentioning

confidence: 99%

Migratory Behavior and Physiological Development as Potential Determinants of Life History Diversity in Fall Chinook Salmon in the Clearwater River

et al. 2018

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We studied the influence of behavior, water velocity, and physiological development on the downstream movement of subyearling fall‐run Chinook Salmon Oncorhynchus tshawytscha in both free‐flowing and impounded reaches of the Clearwater and Snake rivers as potential mechanisms that might explain life history diversity in this stock. Movement rates and the percentage of radio‐tagged fish that moved faster than the average current velocity were higher in the free‐flowing Clearwater River than in impounded reaches. This supports the notion that water velocity is a primary determinant of downstream movement regardless of a fish's physiological development. In contrast, movement rates slowed and detections became fewer in impounded reaches, where water velocities were much lower. The percentage of fish that moved faster than the average current velocity continued to decline and reached zero in the lowermost reach of Lower Granite Reservoir, suggesting that the behavioral disposition to move downstream was low. These findings contrast with those of a similar, previous study of Snake River subyearlings despite similarity in hydrodynamic conditions between the two studies. Physiological differences between Snake and Clearwater River migrants shed light on this disparity. Subyearlings from the Clearwater River were parr‐like in their development and never showed the increase in gill Na+/K+‐ATPase activity displayed by smolts from the Snake River. Results from this study provide evidence that behavioral and life history differences between Snake and Clearwater River subyearlings may have a physiological basis that is modified by environmental conditions.

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“…1; 46°39′ N, 117°25′ W). To obtain individuals large enough for radio‐tagging, fish were collected at the dam via a series of screens and an electronic diversion device (Matthews et al , 1977; Downing et al , 2001). Subyearlings were collected for tagging during three 7 day intervals with starting dates of 26 July, 9 August and 23 August, respectively.…”

Section: Methodsmentioning

confidence: 99%

Behavioural thermoregulation by subyearling fall (autumn) Chinook salmon Oncorhynchus tshawytscha in a reservoir

Tiffan

Kock

Connor

et al. 2009

Journal of Fish Biology

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This study investigated behavioural thermoregulation by subyearling fall (autumn) Chinook salmon Oncorhynchus tshawytscha in a reservoir on the Snake River, Washington, U.S.A. During the summer, temperatures in the reservoir varied from 23 degrees C on the surface to 11 degrees C at 14 m depth. Subyearlings implanted with temperature-sensing radio transmitters were released at the surface at temperatures >20 degrees C during three blocks of time in summer 2004. Vertical profiles were taken to measure temperature and depth use as the fish moved downstream over an average of 5.6-7.2 h and 6.0-13.8 km. The majority of the subyearlings maintained average body temperatures that differed from average vertical profile temperatures during most of the time they were tracked. The mean proportion of the time subyearlings tracked within the 16-20 degrees C temperature range was larger than the proportion of time this range was available, which confirmed temperature selection opposed to random use. The subyearlings selected a depth and temperature combination that allowed them to increase their exposure to temperatures of 16-20 degrees C when temperatures <16 and >20 degrees C were available at lower and higher positions in the water column. A portion of the subyearlings that selected a temperature c. 17.0 degrees C during the day, moved into warmer water at night coincident with an increase in downstream movement rate. Though subyearlings used temperatures outside of the 16-20 degrees C range part of the time, behavioural thermoregulation probably reduced the effects of intermittent exposure to suboptimal temperatures. By doing so, it might enhance growth opportunity and life-history diversity in the population of subyearlings studied.

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Technology developed for diverting passive integrated transponder (PIT) tagged fish at hydroelectric dams in the Columbia River Basin

Cited by 25 publications

References 14 publications

Postrelease Performance of Hatchery Yearling and Subyearling Fall Chinook Salmon Released into the Snake River

Postrelease Performance of Hatchery Yearling and Subyearling Fall Chinook Salmon Released into the Snake River

Migratory Behavior and Physiological Development as Potential Determinants of Life History Diversity in Fall Chinook Salmon in the Clearwater River

Behavioural thermoregulation by subyearling fall (autumn) Chinook salmon Oncorhynchus tshawytscha in a reservoir

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