Cooperative Research Units
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Maturation Timing and Run Identification of Adult Pacific Lamprey, Entosphenus tridentatus, at Willamette Falls, Oregon


September 2009 - January 2011


Objective 1: Describe the body morphology, including body size, of adult Pacific lamprey for the purpose of discerning sexual dimorphisms and stage of maturation.
Objective 2: Estimate the fat content of Pacific lamprey for the purpose of discerning sexual dimorphisms and maturation characteristics.
Objective 3: Identify the sex and status of reproductive maturation of adult Pacific lamprey through gonad histology and hormone assays.
Objective 4: Identify potential links between the energetic status and reproductive development and the seasonal river flow and thermal regimes of adult Pacific lamprey collected at Willamette Falls and compare this information with lamprey recently returned from the sea (to be used as a baseline comparison) for the purposes of identifying runs of Pacific lamprey at Willamette Falls.


Current Staff

Federal Staff: 99

Masters Students: 225

Phd Students: 143

Post Docs: 53

University Staff: 247

5 Year Summary

Students graduated: 658

Scientific Publications: 1872

Presentations: 4186



Funding Agencies

  • Science Support Partnership

Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey