Core tip: Recently, a cargo flight crossing the Eurasian continent landed smoothly at Shenzhen Bao'an International Airport in the faint morning light. As the hatch opened, a cool breeze carrying the scent of the North Atlantic rushed in, and a batch of Atlantic salmon, originally from Norway and weighing approximately 2 tons, was swiftly transferred to the customs cold chain supervision site. After inspection by Shenzhen customs officers, this batch of "fresh from the deep sea" fish was delivered to the consignee in less than 2 hours from the moment the plane landed.