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ICES Journal of Marine Science: Journal du Conseil 2003 60(5):1139-1148; doi:10.1016/S1054-3139(03)00088-2
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Differing susceptibility of anadromous brown trout (Salmo trutta L.) populations to salmon louse (Lepeophtheirus salmonis (Krøyer, 1837)) infection

K.A Glovera,*, Ø Skaalaa, F Nilsena, R Olsena, A.J Tealeb and J.B Taggartb

a Institute of Marine Research, Division of Aquaculture Nordnesgaten 50, PO Box 1870, Nordnes, 5817 Bergen, Norway
b Institute of Aquaculture, University of Stirling Stirling FK9 4LA, United Kingdom

*Correspondence to: K.A. Glover; tel: +47 55236357; fax: +47 55236379. e-mail: kevin.glover{at}imr.no.

Three Norwegian sea trout (Salmo trutta L.) stocks and a farmed Atlantic salmon (Salmo salar L.) stock were challenged with salmon lice (Lepeophtheirus salmonis (Krøyer, 1837)), in a "common garden" experiment. Sea trout from the River Guddal exhibited a significantly lower level of infection, as measured by louse abundance and louse density, than other stocks. In addition, salmon lice developed significantly more slowly on the Guddal stock than on the other stocks. Salmon louse abundance and density were similar for the Rivers Fortun and Sima stocks of sea trout, and abundance of lice, though not density, was highest for farmed Atlantic salmon. Within stocks, there were no differences in infection levels of salmon louse between mature and immature fish, between sexes, or between anal-fin-clipped and non-clipped salmon. Differences in infection level among the sea trout stocks may, it is suggested, reflect genetic differences.

Keywords: Atlantic salmon, genetic, salmon lice, sea trout

Received 10 September 2002; accepted 8 April 2003.


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