After the March 2011 disaster, Taiwan banned food imports from Fukushima and nearby Ibaraki, Gunma, Tochigi and Chiba. It has been conducting random radiation checks on nine categories of imported foods.
Among the 24 firms, 23 filed entry documents inconsistent with the products they imported and one failed to follow proper customs clearance procedures, the administration said.
Wang Te-yuan, deputy director of the FDA's Northern Centre for Regional Administration, said firms that unwittingly imported food products from the five prefectures must report it to authorities or face punishment.
Offenders could be fined up to NT$3 million (HK$750,000) and will lose permission to import the products in question, according to the Act Governing Food Safety and Sanitation.
Authorities beefed up inspections after investigators found some Japanese food imports carrying Chinese labels different from the actual place of origin - a practice allowed in Japan but illegal in Taiwan.
A legislative committee passed a motion in late March tightening inspections on food products imported from Japan.
Under the new measure that came into effect on May 15, such items must carry prefecture-specific labels of origin, and some food products from certain prefectures must carry documents proving that they had passed radiation checks.
Source: South China Morning Post