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C.M. Neville

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...
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