Reclamation Information Sharing Environment (RISE)

Mainstem and tributary passage are some of the primary threats associated with declining populations of Pacific Lamprey (Entosphenus tridentatus) in the Columbia River Basin. Juvenile lamprey are of special interest because their downstream migration may be affected by barriers such as dams or water diversions. Telemetry studies to describe the movement and passage of juvenile lamprey have not been possible until the recent development of a micro-transmitter specifically for use in juvenile lamprey and eels. Through a collaborative research approach, we used these prototype transmitters and acoustic monitoring arrays installed for a juvenile salmon (Oncorhynchus spp.) migration study to evaluate juvenile lamprey movements in the Yakima River (river kilometer 718 to the river mouth) in 2019 and 2020. Two USGS Open-File Reports were prepared for this study, an interim and final report. The reports contain detailed descriptions of the study background, methods, and results. The USGS reports are attached to the S&T report as Appendix A and Appendix B and are also available at the links below: Appendix A: Movements of Juvenile Pacific Lamprey (Entosphenus tridentatus) in the Yakima and Columbia Rivers, Washington, 2018—A Pilot Study Using Acoustic Telemetry, USGS Open-File Report 2019-1058, https://pubs.usgs.gov/publication/ofr20191058 Appendix B: Monitoring the Movements of Juvenile Pacific Lamprey (Entosphenus tridentatus) in the Yakima River, Washington Using Acoustic Telemetry, 2019-20, USGS Open-File Report 2022–1052, https://pubs.usgs.gov/publication/ofr20221052 Data collected during the study is stored and publicly available at: Pacific States Marine Fisheries Commission, 2022, app.streamnet.org-/files/822/: Pacific States Marine Fisheries Commission, StreamNet—Fish Data for the Northwest data files, accessed May 9, 2022, at https://app.streamnet.org/files/822/.