The European variant of infectious salmon anaemia virus (ISAV) was said to have arrived in British Columbia almost five years ago, but then the Canadian Food Inspection Agency said it was not so after testing two suspect salmon. That was in 2011.

But if British Columbia was ISAV-free then, it almost certainly is not now, according to a study of more than 1,000 farmed and wild fish published Jan. 6 under the title Discovery of variant infectious salmon anaemia virus (ISAV) of European genotype in British Columbia, Canada.

The study provides the first published evidence of the arrival in British Columbia of the most feared virus in the salmon farming industry. It also puts wild salmon at risk.

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