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Three-dimensional migration behavior of juvenile salmonids in reservoirs and near dams

Journal Article · · Scientific Reports
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4];  [4];  [5];  [5]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); DOE/OSTI
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Mainstem Fish Research, LLC< Richland, WA (United States)
  4. US Army Corps of Engineers, Walla Walla, WA (United States)
  5. Univ. of Washington, Seattle, WA (United States). School of Aquatic and Fishery Sciences
+ Show Author Affiliations

To acquire 3-D tracking data on juvenile salmonids, Juvenile Salmon Acoustic Telemetry System (JSATS) cabled hydrophone arrays were deployed in the forebays of two dams on the Snake River and at a mid-reach reservoir between the dams. The depth distributions of fish were estimated by statistical analyses performed on large 3-D tracking data sets from ~33,500 individual acoustic tagged yearling and subyearling Chinook salmon and juvenile steelhead at the two dams in 2012 and subyearling Chinook salmon at the two dams and the mid-reach reservoir in 2013. This research investigated the correlation between vertical migration behavior and passage routes. The depth distributions of fish within the forebays of the dams were significantly different from fish passing the mid-reach reservoir. Fish residing deeper in the forebay tended to pass the dam using deeper powerhouse routes. This difference in depth distributions indicated that the depth distribution of fish at the mid-reach reservoir was not related to behaviors of fish passing through certain routes of the adjacent dams. For fish that were detected deeper than 17.5 m in the forebays, the probability of powerhouse passage (i.e., turbine) increased significantly. Another important finding was the variation in depth distributions during dam passage associated with the diel period, especially the crepuscular periods.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; U.S. Army Corps of Engineers (USACE)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1624376
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Modelling mitigation measures for smolt migration at dammed river sections journal July 2019
American eel state of buoyancy and barotrauma susceptibility associated with hydroturbine passage journal January 2019
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