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Cited by 34Fish Ecology and Management StudiesMarine and fisheries researchFish Biology and Ecology Studies

Migrational Characteristics, Biological Observations, and Relative Survival of Juvenile Salmonids Entering the Columbia River Estuary, 1966-1983, 1985 Final Report of Research.

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Dawley, Earl M.·1986
DOI 10.2172/5294424
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Abstract

Natural runs of salmonids in the Columbia River basin have decreased as a result of hydroelectric-dam development, poor land- and forest-management, and over-fishing. This has necessitated increased salmon culture to assure adequate numbers of returning adults. Hatchery procedures and facilities are continually being modified to improve both the efficiency of production and the quality of juveniles produced. Initial efforts to evaluate changes in hatchery procedures were dependent upon adult contributions to the fishery and returns to the hatchery. Procedures were developed for sampling juvenile salmon and steelhead entering the Columbia River estuary and ocean plume. The sampling of hatchery fish at the terminus of their freshwater migration assisted in evaluating hatchery production techniques and identifying migrational or behavioral characteristics that influence survival to and through the estuary. The sampling program attempted to estimate survival of different stocks and define various aspects of migratory behavior in a large river, with flows during the spring freshet from 4 to 17 thousand cubic meters per second (m/sup 3//second).

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  • A central dogma in salmon ecology and management often constrains juvenile life history diversity to ocean type and stream type juveniles, denoting whether individuals out-migrate to the ocean before or after their first year of life.

    “A central dogma in salmon ecology and management often constrains juvenile life history diversity to ocean type and stream type juveniles, denoting whether individuals out-migrate to the ocean before or after their first year of life [7, 8].”

    From Estimating Common Growth Patterns in Juvenile Chinook Salmon (Oncorhynchus tshawytscha) from Diverse Genetic Stocks and a Large Spatial Extent (2016) · cites this paper as [8]

    The Analysis section distinguishes yearling from subyearling Chinook salmon migrants, supporting the age-based part of the claim. The Conclusions section also says wild Chinook salmon have diverse migration timing and age structure. Our copy does not describe an ocean-type/stream-type classification or say that it is a central dogma constraining how juvenile diversity is understood; page numbers were not provided for these passages. (LLM, conf=0.79)

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References 39 · Cited by 34

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Authors
Dawley, E. M.
Corresponding author
Dawley, Earl M.
Publisher
Office of Scientific and Technical Information (OSTI)
Published
1986-04-01
DOI
10.2172/5294424
OpenAlex
W2121853700
Cited by
34
References
39
Citations by year
2026: 1 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 1 · 2019: 1 · 2017: 1 · 2016: 2 · 2015: 2 · 2014: 3 · 2013: 3 · 2012: 2
Type
report
Language
en
Open access
Locations
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • University of North Texas Digital Library (University of North Texas) (submittedVersion)
Funders
  • U.S. Fish and Wildlife Service
  • California Department of Fish and Wildlife
Topics
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
Keywords
juvenile salmonids, steelhead, Columbia River estuary, relative survival, hatchery-reared fish, migratory behavior, freshwater migration, hydroelectric dams, salmon aquaculture

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