Earlier in the day, the Ministry banned imports from Slovenia of live poultry and poultry products for human consumption and industrial use, except thermally processed products.
The ban also applies to 23 other countries with reported bird flu cases, including Italy, Bulgaria and Greece, Ministry spokesman Mladen Pavic told Hina.
Croatia is stepping up passenger and cargo checks at border crossings and in ferry ports to prevent imports of foods of animal origin and the possible intake of the disease, he said.
The H5 strain of avian influenza has been identified in a dead swan near Maribor in Slovenia, about 100 km northwest of Zagreb. The site has been sealed off and inspections have been intensified within 10 kilometres of the site, according to the European Commission.
Pavic said that the Croatian Ministry of Agriculture did not know which measures were being taken by Slovenia to contain the spread of the bird flu virus.