The area within a three-kilometre radius of the fish farm is cordoned off and access is banned to everybody except competent authorities including police and veterinary services that are monitoring the area.
All poultry within the three-kilometre-radius will be euthanised on Sunday and owners will be compensated according to the market price.
Not that stringent measures have been applied within a 20-kilometre-radius of the pond.
The spokesman for the Croatian Agriculture Ministry, Mladen Pavic, told Hina today that fishing was also banned at that fish farm owing to a possibility that H5 N1 virus may be conveyed by water.
Five dead swans were found at the fish farm in Nasice, another eastern Croatian town, which is 15 kilometres southeast of Zdenci.
Pavic added that the dead swans from the Nasice fish farm had been sent to the relevant laboratory in Zagreb and results of the analysis are expected on Monday.
According to the Nasice fish farm director, two dead swans were immediately taken from the location, while another three were in an inaccessible area, and they would be collected by relevant veterinary services in the course of the day.
The epidemiology department of the public health in the eastern city of Osijek has called on citizens in Osijek-Baranja County not to touch dead birds if they find bird corpses.
In that case, citizens are advised to call police or emergency services and inform them of what they have seen, the head of the epidemiology department said.
The local association of friends of animals called on those who have birds such as parrots or canaries as pats to behave responsibly and not abandon them in a fear that they may contract bird flu as this possibility is nonexistent.
The national commission for coordination of activities in cases of extraordinary threats to health of the population reiterated on Saturday that there was no threat to the health of citizens in Croatia.
Citizens who live in the area where bird flu was reported are not exposed to any threat also.
The commission will regularly meet and monitor the situation so that it can be able to inform citizens on time.
The head of the epidemiology department within the Croatian Institute for Public Health, Ira Gjenero- Margan, also confirmed that there was no threat to human health.
"It has never been reported anywhere in the world that people contracted the illness from wild birds. The illness has been conveyed (to people) through intensive contacts between people and domestic poultry when it was kept in very unhygienic conditions," she said.
The Croatian Government held an emergency session on Friday evening after an H5 subtype avian influenza virus had been isolated in eastern Croatia.
Prime Minister Ivo Sanader told reporters at government headquarters that according to experts and all information available "there is no threat to human health."
He added that samples would be sent to a reference centre in Great Britain on Saturday to see if it was an H5 N1 virus.
Results from the Weybridge laboratory are expected in about two days.
Sanader said that a team of experts in charge of monitoring avian influenza would be in constant contact with the government.
The crisis management team is headed by Agriculture Minister Petar Cobankovic and Health Minister Neven Ljubicic.
The government has taken all necessary steps to contain the virus.
The prime minister said that relevant authorities had notified the European Commission, the World Organisation for Animal Health and neighbouring countries of the finding.
"The Croatian government wishes to warn all Central and Southeast European countries about (the virus) and about the need for a constant exchange of information," the prime minister said.