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State Library of Oregon: Oregon Documents

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A measured delay in the migration of adult chinook salmon at Bonneville Dam on the Columbia River

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TitleA measured delay in the migration of adult chinook salmon at Bonneville Dam on the Columbia RiverPersonal NameSchoning, Robert W.Johnson, Donald R. (Donald Robert) 1917-2000Corporate NameOregon Fish CommissionSubjectChinook salmon -- Migration -- Columbia RiverChinook salmon -- Effect of dams on -- Columbia RiverChinook salmon -- Bonneville Dam (Or. and Wash.)Date1956-04-30CollectionFish & Wildlife Last edited by: Angie Jannelli

LanguageengPublisherFish Commission of OregonPlace of PublicationPortland, OregonSeries TitleContribution (Oregon. Fish Commission) ;Series Numberingno. 23Formonline resourceExtent1 online resource (16 pages)Type of ResourcetextIssuancemonographicSummaryA study was undertaken in the fall of 1948 by the Oregon Fish Commission to determine the possible presence and importance of a delay in the migration of adult chinook salmon (Oncorhynchus tshawytscha) at Bonneville Dam on the Columbia River. Approximately 650 chinook were captured, tagged, and released at the Oneonta trap 6.7 miles below Bonneville Dam and 200 were handled similarly at the dam and released above. The tag returns from Cello Falls, the main commercial fishing area, 60 miles above Bonneville, were compared by location of tagging with regard to date of tagging and the number of days en route. The linear correlation between tagging date and days out was significant for the 39 recoveries tagged at Bonneville but not for the 35 from Oneonta. The later in the season the fish were tagged at Bonneville the more rapidly they migrated to Cello Falls. With no adjustment for the difference in distance between the two tagging locations, the fish from Oneonta took a significant 3.4 days longer to make the trip to Celilo than the Bonnevilletagged fish. When correcting for the distance difference, the delay was reduced to 3.0 or 2.6 days, either of which was still significant. Although the number of recoveries is small, all of those used are believed to be reliable and sufficient for statistical analysis. The study represents only one year's work and investigations of another year may refute or substantiate these findingsNoteRobert W. Schoning and Donald R. JohnsonTitle from PDF title page (viewed on April 30, 2024)Includes bibliographical references (page 14)Mode of access: Internet from the Oregon Government Publications CollectionThis archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposesText in English

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Other FormatPrint version:. Schoning, Robert W. Measured delay in the migration of adult chinook salmon at Bonneville Dam on the Columbia River. Portland : Fish Commission of Oregon, 1956. (OCoLC)20180400Library ClassificationFiOCLC Number1432183569Restrictions on Accesshttp://rightsstatements.org/vocab/CNE/1.0