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Life History and Abundance of Young Adult Lampetra ayresi in the Fraser River and Their Possible Impact on Salmon and Herring Stocks in the Strait of Georgia

Dates

Publication Date

Citation

Bearnish, R. J., and 1. H. Youson. 1987. Life history and abundance of young adult kampetra ayresi in the Fraser River and their possible impact ow salmon and herring stocks in the Strait of Georgia. Can. Fish. Aquat. Sci. 44: 525-537.

Summary

Metamorphosis in harnpetra ayresi begins in July but is not completed until approximately April of the following year when the oesophagus opens. The prolonged period of metamorphosis differs from that of other lamprey species and may have evolved in response to the pattern of discharge of the Fraser River. Prior to the opening of the oesophagus, some metamorphosing k. ayresi congregate just upstream of the salt water that moved into the river from the ocean. Soon after the oesophagus opens, lampreys are able to osn-soreguiate in salt water and enter the Strait of Georgia from May to july. Maximum numbers gs to sea in early June, correlated with the maximum discharge from the Fraser River. Laboratory studies indicated that there was [...]

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Beamish and Youson 1987 River lamprey life history.pdf
“Beamish and Youson 1987 River lamprey life history”
1.76 MB application/pdf

Communities

  • Pacific Lamprey Data Clearinghouse
  • Pacific Region, Region 1
  • US Fish and Wildlife Service (USFWS)

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