Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.
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Abstract
We describe the migration distances and timing of the adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River Basin (Oregon, U.S.A.). We conducted aerial surveys to track radio-tagged fish upstream of a major waterfall and hydropower complex en route to spawning areas. We detected 24 out of the 43 fish that passed the waterfall-hydropower complex. Of the detected fish, 17 were detected multiple times. Their maximum migration distance upstream in the mainstem Willamette approximated a normal distribution. The maximum distance migrated upstream did not significantly correlate with total body length (r = −0.186, P = 0.385) or date that the fish passed Willamette Falls (r = −0.118, P = 0.582). Fish migrated primarily during the spring to early summer period before stopping during the summer, when peak river temperatures (≥20°C). However, at least three fish continued to migrate upstream after September. Behavior ranged from relatively slow migration, followed by holding; to rapid migration, followed by slow migration further up in the basin. This study provides a basis for informing more detailed research on Pacific lamprey in the future.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A. |
| Series title | Environmental Biology of Fishes |
| DOI | 10.1007/s10641-011-9910-3 |
| Volume | 93 |
| Issue | 2 |
| Year Published | 2012 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Contributing office(s) | Cooperative Research Unit Seattle, Western Fisheries Research Center |
| Description | 10 p. |
| First page | 245 |
| Last page | 254 |
| Country | United States |
| State | Oregon |
| Other Geospatial | Willamette River |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |