An aerial drone photo taken on Sept. 16, 2025 shows crab ponds in Pubagang Town of Sanmen County, east China's Zhejiang Province. Autumn is the peak harvest season for farm-raised blue crabs in Sanmen County, which is home to nearly 90,000 mu (about 6,000 hectares) of crab ponds. In recent years, the county has developed a smart crab cultivation system by introducing technologies such as Internet of things (IoT). (Xinhua/Weng Xinyang)

A staff member monitors water quality through a mobile phone application at an aquaculture seedling technology company in Jiantiao Town of Sanmen County, east China's Zhejiang Province, Sept. 16, 2025. Autumn is the peak harvest season for farm-raised blue crabs in Sanmen County, which is home to nearly 90,000 mu (about 6,000 hectares) of crab ponds. In recent years, the county has developed a smart crab cultivation system by introducing technologies such as Internet of things (IoT). (Xinhua/Weng Xinyang)

A staff member promotes local blue crabs via live streaming at an agricultural development company in Pubagang Town of Sanmen County, east China's Zhejiang Province, Sept. 16, 2025. Autumn is the peak harvest season for farm-raised blue crabs in Sanmen County, which is home to nearly 90,000 mu (about 6,000 hectares) of crab ponds. In recent years, the county has developed a smart crab cultivation system by introducing technologies such as Internet of things (IoT). (Xinhua/Weng Xinyang)

A breeder harvests blue crabs at a crab pond in Pubagang Town of Sanmen County, east China's Zhejiang Province, Sept. 16, 2025. Autumn is the peak harvest season for farm-raised blue crabs in Sanmen County, which is home to nearly 90,000 mu (about 6,000 hectares) of crab ponds. In recent years, the county has developed a smart crab cultivation system by introducing technologies such as Internet of things (IoT). (Xinhua/Weng Xinyang)