Online retailers in parts of China ran out of salt on Thursday after Japan began discharging treated radioactive wastewater from the wrecked Fukushima nuclear power plant, setting off a buying frenzy among anxious consumers.
One of the world's biggest seafood importers, China banned all supplies of aquatic products from Japan in response to the discharge, citing the risk of radioactive contamination and fuelling consumer fears.
Several brands of salt were sold out on online food delivery sites in the coastal province of Fujian as well as in parts of Beijing and the commercial capital of Shanghai, according to media reports and Reuters tests.
"It's really not necessary to hoard salt, but when I saw loads of people panic-buying this morning, I quietly ordered 10 packets," wrote one user on the microblogging platform Weibo.
"I bought lake salt and salt from salt mines. I now avoid sea salt."
Shelves in one Beijing supermarket had been stripped of salt, social media pictures showed, while media said shares in some Chinese saltwater purification firms surged as much as a tenth.
Industry groups and authorities in the coastal provinces of Fujian and Guangdong tried to reassure consumers.
Officials in Fujian's city of Fuzhou vowed on social media to "ensure supply chain stability and sufficient stocks of culinary salt", and urged people to "rationally buy salt according to their needs".
State-owned Guangdong Salt Industry Group told media that the provincial government had sufficient salt reserves, adding that its tests showed locally produced sea salt was safe.
China has strict food safety rules, with sufficient domestic salt production to meet demand, so customers should not hoard the seasoning, the director of the China Salt Industry Association told media.
Japan accounts for less than 4% of China's seafood imports, customs data shows, although it provides all imports of bluefin tuna.
China has vocally opposed the move throughout, while Tokyo in turn criticised Beijing for spreading "scientifically unfounded claims".
