Generally, river crabs are sent by SF Express, and SF has refrigerated trucks. In addition, there are ice bottles frozen by mineral water bottles in the foam box of river crabs. SF Express is usually mailed today and arrives the next day, which is still very fast. My family raises river crabs in rice fields and sends them to the whole country by SF Express every year, but crabs need to be fresh. If they stay out of water for a long time, they are likely to die. Dead river crabs contain a lot of bacteria and are not recommended to be eaten.