Fisheries Resources
Pacific Region

Pacific Lamprey Assessment and Template for Conservation Measures


The Assessment tracks the current knowledge of Pacific Lamprey habitat requirements; abundance; historic and current distribution; describes threats and factors for decline; and identifies conservation actions and research, monitoring, and evaluation needs. To systematically characterize the conservation risk of Pacific Lamprey across its range, an assessment was conducted with a diagnostic tool adapted from NatureServe by using existing demographic and threat information. This information was collected through a series of regional meetings attended by our partners. Individual watersheds were analyzed to rank the relative risk of extirpation, and these risks were summarized by region. Pacific Lamprey populations are declining in abundance and becoming restricted in distribution throughout Washington, Oregon, Idaho, and California due to key threats such as mainstem and tributary obstacles to passage, reduced flows and dewatering, stream and floodplain degradation, and water quality. The majority of watersheds are at relatively high risk, with very few that are relatively secure.

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Last updated: April 24, 2014

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