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Migration patterns of Pacific lamprey (Lampetra tridentata) in the lower Columbia River, 1997
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2001
[PDF-12.86 MB]
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Description:Pacific lamprey (Lampetra tridentata) abundance, like that of other northwest anadromous fish species, has significantly declined in recent years. Study of adult migration patterns past dams and reservoirs in the Columbia River Basin may provide some insight into factors that affect or limit Pacific lamprey survival. Radiotelemetry has been used to determine migration behavior for many anadromous fish species; however, we are unaware ofits use in Pacific lamprey studies. In 1997, we evaluated passage patterns of upstream-migrating radio-tagged Pacific lamprey in the lower Columbia River. Objectives ofthis study were to determine 1) return time from the release sites back to Bonneville Dam, 2) passage routes and behavior at the dam, and 3) migration rates through reservoirs.
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Rights Information:CC0 Public Domain
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