Attacks by jellyfish including Apolemia uvaria, pictured, commonly known as the string jellyfish or barbed wire jellyfish, have caused problems for salmon farmers in Norway this year.

Jellyfish attacks reduce SalMar’s salmon harvest volume by 5,000 tonnes

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The world’s second-largest salmon farmer, SalMar, has reduced its 2023 harvest volume guidance by 5,000 gutted weight tonnes due to challenges related to jellyfish, it said in a market announcement today.

SalMar, which co-owns Scottish Sea Farms with fellow Norwegian salmon producer Lerøy, said jellyfish were affecting the expected volume for both central and northern Norway.

The total expected harvest volume in 2023 is 142,000 gwt in central Norway and 92,000 gwt in northern Norway.

“In total, this represents a reduction of 5,000 tonnes, with 2,000 tonnes in segment Farming Central-Norway and 3,000 tonnes in segment Farming Northern-Norway, from the previously communicated expected harvest volume for 2023,” said SalMar.