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Adult Pacific Lamprey Trends and Abundance

Upper Columbia Region

Adapted from Luzier, C.W., H.A. Schaller, J. K. Brostrom, C. Cook-Tabor, D.H. Goodman, R.D. Nelle, K. Ostrand, and B. Streif. 2011. Pacific Lamprey (Entosphenus tridentatus) Assessment and template for Conservation Measures. U.S. Fish and Wildlife Service, Portland, Oregon. 282 pp.

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alt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_textalt_text The uncertainty associated with estimating Pacific lamprey status and trends for many watersheds in the Upper Columbia River region is quite high due to the lack of targeted surveys, harvest records, and dam counts. Relying on best professional judgment, expansions of data from other species, and partial surveys for a limited area of the watershed, managers and researchers have estimated that up to 550 adult Pacific lamprey may comprise the Upper Columbia River region population. The managers and researchers suggested that the short-term trend in abundance is rapidly-severely declining. The highest threats to the persistence of Pacific lamprey in the Upper Columbia River region have been identified as the Federal Columbia River Power System dams on the mainstem Columbia River (limit passage), dewatering and flow management followed by stream and floodplain degradation, and water quality.