World Major New Zealand salmon producer shuts farms as warming waters cause mass die-offs


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New Zealand’s biggest king salmon farmer says it is shutting some of its farms after warming seas prompted mass die-offs of fish, warning that it is a “canary in the coalmine” for climate change.

New Zealand is the world’s largest producer of king, or “chinook” salmon, a highly valued breed which fetches a premium on the world market. The country’s farms account for about 85% of global supply, New Zealand King Salmon chief executive Grant Rosewarne said.

Now, increasingly warm summer seas mean the fish at some sites are dying en masse before they can reach maturity, leaving farmers dumping thousands of tonnes of dead fish into local landfills.

“There should be alarm bells,” Rosewarne said. “When I joined this company, I never heard of the term ‘marine heatwave’…. Recently, there’s been three of them.

“We thought we had more time,” Rosewarne said. “Climate change is a slow process but faster than many people think – certain industries are … canaries in the coalmine.”

“We thought that climate change is a really slow effect, detected over decades – and possibly we’ve got, two decades before we’re even impacted. Well, within one decade we were impacted.”

It’s considered usual for a small percentage of farmed fish to die each year, but warming temperatures have significantly increased those deaths. In 2022, the King Salmon Company’s “percentage mortality of biomass” for the fish was up to 42% in warm water areas where the fish were not towed to cooler zones; compared to 17% in 2018. Even when the fish were towed out to cooler waters, many were dying: 37% in 2022, compared to just 10% in 2018.

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