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Susceptibility to the salmon louse Lepeophtheirus salmonis was recorded in three year-classes of Atlantic salmon with 300 (year-classes 2000 and 2001) and 50 (year-class 2001) full-sib families. The number of lice during natural infections was recorded on individual fish in all year-classes, while recordings from a challenge test were included for year-class 2002. Among the year-classes the mean number...
Norway is home to the largest populations of Atlantic salmon Salmo salar L., and the largest salmon-farming industry in the world. Salmon lice Lepeophtheirus salmonis (Krøyer) emerged as a problem soon after establishment of the industry in the 1970s. This parasitic copepod has been blamed for the collapse of sea trout (Salmo trutta L.) stocks in several countries, and is also perceived as a serious...
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