| 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. |
| Genre: | Article |
| ProdID: | 70004020 |
| Citation Author: | Clemens, Benjamin J.; Mesa, Matthew G.; Magie, Robert J.; Young, Douglas A.; Schreck, Carl B. |
| Citation Contributing Office: | Cooperative Research Unit Seattle; Western Fisheries Research Center |
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| Citation End Page: | 254 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Biology of Fishes |
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| Citation Phsyical Description: | 10 p. |
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| Citation Publisher: | Springer |
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| Citation Search Results Text: | Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.; 2012; Article; Journal; Environmental Biology of Fishes; Clemens, Benjamin J.; Mesa, Matthew G.; Magie, Robert J.; Young, Douglas A.; Schreck, Carl B. |
| Citation Start Page: | 245 |
| Citation Volume: | 93 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.; 2012; Article; Journal; Environmental Biology of Fishes; Clemens, Benjamin J.; Mesa, Matthew G.; Magie, Robert J.; Young, Douglas A.; Schreck, Carl B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (INDEX PAGE): | http://dx.doi.org/10.1007/s10641-011-9910-3 |
| Date Other: | Tue, 5 Jun 2012 00:00 -0500 |
| Publisher: | Springer |
