Abstract
A total of 419 Atlantic salmon representing three wild stocks and two major and distinct Norwegian farmed strains were challenged with sea lice ( Lepeophtheirus salmonis) in replicated mixed stock tanks. Infection level, recorded as density of lice (lice abundance divided by fish body surface area), varied by up to 29% among the stocks and strains ( P<0.001) at 31 days post-infection. Post hoc tests revealed that the infection level observed on the wild Dale stock, displaying the lowest density of lice, was significantly lower than observed on the wild Vosso stock and the farm 2 strain, which displayed the highest and second highest infection levels, respectively. Pairwise comparisons of the differences in lice density among the other stocks, including the two farm strains, were not significant. Differences in infection level observed among the stocks and strains may reflect genetic differences in susceptibility to infection with sea lice among them.
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