The development came a day after the outbreak was confirmed at a farm in Kashima City of the southern Japanese prefecture of Saga, the Ministry of Agriculture, Forestry, and Fisheries of Japan announced, reports Xinhua news agency.
According to the Ministry, the affected farm housed approximately 40,000 laying hens.
Preventive measures were taken including culling all 40,000 birds on the affected farm, while the transportation of poultry and egg products within a 10 km radius of the outbreak's epicenter from the affected farm to areas outside the designated zone was restricted.
The movement, which involved about 255,000 birds at 12 poultry farms, came after genetic testing confirmed that the dead birds at the affected farm were infected with the H5 subtype of avian influenza.
The bird flu season in Japan typically begins in October each year.
Prime Minister Fumio Kishida requested that relevant authorities, including the Ministry of Agriculture, Forestry, and Fisheries, collaborate closely and swiftly implement thorough preventive measures to cope with avian influenza infection.
