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Pacific salmon and Pacific herring mortalities in the Fraser River plume caused by river lamprey (Lampetra ayresi)

Dates

Publication Date

Citation

R.J. Bearnish and C.M. Neville. 1995. Pacific salmon and Pacific herring mortalities in the Fraser River plume caused by river lamprey (Lampetra ayresi), Can. J. Fish. Aquat. Sci. 52: 644-450.

Summary

Abstract: River lamprey (Lampetra ayresi) enter the Strait of Georgia from the Fraser River and feed almost exclusively on Pacific herring (Ckupea harenglas) and salmon (Oncsrhyncheas spp.). Although the major prey of river lamprey is Pacific herring, the greater effect of lamprey predation was on the populations sf chinook (0. tshawyfscha) and coho (0. kisutch) salmon. In 1990 and 1991, river lamprey killed a minimum of 20 million and 18 million chinook salmon, respectively, and a minimum of 2 million and 10 million coho salmon in the same years. In 1991, river lamprey in the Fraser River plume killed an equivalent of approximately 65 and 25% sf the total Canadian hatchery and wild production of coho and chinook salmon, respectively. [...]

Contacts

Attached Files

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Beamish and Neville 1995 River lamprey prey mortalities.pdf
“River Lamprey prey mortalities. Beamish and Neville 1995”
814.64 KB

Communities

  • Pacific Lamprey Data Clearinghouse
  • Pacific Region, Region 1
  • U.S. Fish and Wildlife Service

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