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Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

Environmental Biology of Fishes

By:
, , , ,
DOI: 10.1007/s10641-011-9910-3

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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.

Additional Publication Details

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:
Springer
Publisher location:
Amsterdam, Netherlands
Contributing office(s):
Western Fisheries Research Center, Cooperative Research Unit Seattle
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
245
Last page:
254
Country:
United States
State:
Oregon
Other Geospatial:
Willamette River