Fish farms transmit viruses to endangered wild Pacific salmon, new evidence shows

By Gideon Mordecai, Liber Ero Postdoctoral Fellow, Department of Medicine, University of British Columbia

Pacific salmon are foundation species to British Columbia’s coastal ecosystem, and have been a key source of nutrients and energy to some of Canada’s most iconic species, including bears and killer whales, for thousands of years. More recently, they have shared their waters with net pens filled with non-native Atlantic salmon that are being farmed for food.

Some wild Pacific salmon populations have been in sharp decline since the early 1990s. For example, more than half of all Chinook salmon populations in…

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