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2270 Atlantic salmon smolts representing 30 mostly full-sibling families were transferred to a sea cage in central Norway in May 2003. In the period between transfer to sea and termination of the experiment in August 2003, 42.2% of these fish died, mostly as a result of an outbreak of IPN virus. 1198 of the survivors were investigated in their abundance of the sea lice Lepeophtheirus salmonis and...
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