Mass die-offs of farmed salmon are increasing around the world, with Canada experiencing some of the biggest and most frequent mortality events, new research has found.
The largest mass die-off was found at a Grieg Seafood operation off British Columbia’s Sunshine Coast, where 3.8 million fish died in a single event. In the U.K., meanwhile, the largest mass mortality event hit 1.5 million dead fish. Not all countries collected data on fish mass mortality events in the same way. In Norway, fish kill data was collected at the county level, making it impossible to know the highest mortality events.
“The resulting economic devastation to the Chiloe region was such that it required government cash supports for affected households,” the authors write. Mobley of Grieg Seafood added that when her team conducted an analysis using the authors' definition of a mass mortality event, they did not find a rise in events across their B.C. salmon farms over the past eight years.
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