In a letter e-mailed to IntraFish, buyer Kasyanov Mikhail of X5, which owns 1,500 stores in Russia, stated the “30 percent” increase is not caused by suppliers but by the producers in Norway.

“Our suppliers have granted us Norwegian export invoices,” and this proves “the event is not caused by their actions,” he said.

It forces the company to “revise its strategy” of promoting chilled salmon and it will look to “replacements in the shops,” said Mikhail.

Intrafish received a nearly identical letter from the Real-chain that has 12 hypermarkets in Russia.