Spatial and temporal distribution of bull trout (&lt;em&gt;Salvelinus confluentus&lt;/em&gt;)-size fish near the floating surface collector in the North Fork Reservoir, Oregon, 2016

Adams, Noah S.; Smith, Collin D.

doi:10.3133/ofr20171080

Cited by 5 publications

(10 citation statements)

References 8 publications

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“…The FSC at North Fork Dam is one of several surface‐oriented fish collectors in use at high‐head storage dams in the Pacific Northwest (Adams & Smith, 2017). Factors influencing the performance of surface collectors are generally defined in physical or hydrological metrics without incorporating predator fish assemblage data into physical or performance evaluation design.…”

Section: Discussionmentioning

confidence: 99%

“…The FSC at North Fork Dam is one of several surface-oriented fish collectors in use at high-head storage dams in the Pacific Northwest (Adams & Smith, 2017). in close proximity to their entrances (Beeman et al, 2016b;Khan et al, 2012;McIlvaine, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…This tracking is used to obtain counts and movements of individual fish, along with associated behavioural and morphometric data (Simmonds & MacLennan, 2005). A step‐by‐step description of the operational procedures used for processing acoustic signals may be found in Adams and Smith (2017). Imaging sonar technology cannot distinguish individual fish that have entered and exited the field of view multiple times; therefore, the following analysis assumes that each fish track, not the fish, is independent observation.…”

Section: Methodsmentioning

confidence: 99%

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Predator and prey events at the entrance of a surface‐oriented fish collector at North Fork Dam, Oregon

Smith

Plumb

Adams

et al. 2020

Fisheries Management Eco

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Quantifiable estimates of predator–prey interactions and relationships in aquatic habitats are difficult to obtain and rare, especially when individuals cannot be readily observed. To overcome this observational impediment, imaging sonar was used to assess the cooccurrence of predator‐size fish and juvenile salmonids, Oncorhynchus spp., at the entrance to a floating surface collector (FSC) in the forebay of North Fork Dam on the Clackamas River, Oregon (USA). Imaging sonar can be used to transform active sound waves into visual data, making it possible to obtain continuous underwater observations on the presence and interspecific interactions between predator‐size fish and prey (juvenile salmonids). Hourly counts of smolt‐size fish tracks, diel phase, water clarity and river discharge were used as covariates within a zero‐inflated Poisson model to determine how these factors may influence the number of predators in front of the FSC. Both the number of smolt‐size fish tracks and diel phase had the strongest effects on the number of predator‐size fish tracks, with more predator‐size fish tracks observed during the daytime, and as the number of smolt‐size fish tracks increased. Additionally, the presence of predator‐size fish may affect the abundance and direction of travel of juvenile salmonids, as fewer smolt‐size fish were observed when predators were present, and a greater proportion of smolt‐size fish were observed travelling away from the FSC when predator‐size fish were present. This study provides estimates of predator and prey fish abundance in the vicinity of surface collection systems at moderate‐sized hydropower projects and could help resource managers better understand mechanisms that can influence the survival and passage behaviour of juvenile salmonids using surface collection structures at dams.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Predator and prey events at the entrance of a surface‐oriented fish collector at North Fork Dam, Oregon

Smith

Plumb

Adams

et al. 2020

Fisheries Management Eco

Self Cite

View full text Add to dashboard Cite

show abstract

“…The FSC at North Fork Reservoir is one of several surface-oriented collectors in use at storage and power generating dams in the Pacific Northwest (Adams and Smith, 2017). The facilities at North Fork Reservoir, along with other surface collectors, are known to have bull trout in close proximity to the entrance of the collector (McIlvaine, 2015;Beeman and others, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Unfiltered video footage was observed congruently with tracking of the processed acoustic signals during target tracking to ensure that only fish targets were included in the dataset and target morphometric data was concomitant with target data observed in the video footage. The operational steps used for processing acoustic signals may be found in Adams and Smith (2017).…”

Section: Data Processingmentioning

confidence: 99%

Fish behavior and abundance monitoring near a floating surface collector in North Fork Reservoir, Clackamas River, Oregon, using multi-beam acoustic imaging sonar

Smith¹,

Plumb²,

Adams³

2018

Open-File Report

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Monitoring fish abundance and behavior, using multi-beam acoustic imaging sonar, at a Selective Water Withdrawal structure in Lake Billy Chinook, Deschutes River, Oregon, 2020

Spatial and temporal distribution of bull trout (<em>Salvelinus confluentus</em>)-size fish near the floating surface collector in the North Fork Reservoir, Oregon, 2016

Cited by 5 publications

References 8 publications

Predator and prey events at the entrance of a surface‐oriented fish collector at North Fork Dam, Oregon

Predator and prey events at the entrance of a surface‐oriented fish collector at North Fork Dam, Oregon

Fish behavior and abundance monitoring near a floating surface collector in North Fork Reservoir, Clackamas River, Oregon, using multi-beam acoustic imaging sonar

Monitoring fish abundance and behavior, using multi-beam acoustic imaging sonar, at a Selective Water Withdrawal structure in Lake Billy Chinook, Deschutes River, Oregon, 2020

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