A extortion portion has been acceptable up pursuing an outbreak of vertebrate flu successful Angus.
Highly pathogenic avian influenza (HPAI), besides known arsenic H5N1, was reported astatine Over Ascreavie House, Kingoldrum, successful the Kirriemuir area.
Chief veterinary serviceman Sheila Voas announced the study connected Friday night.
A 3km (2 mile) extortion portion and a 10km (6 mile) surveillance portion astir the tract person been enactment successful place.
Restrictions person been implemented to halt the question of poultry, carcasses, eggs, utilized poultry litter and manure to forestall immoderate further dispersed of the disease.
A declaration published connected the Scottish goverment's website, signed by Ms Voas, said the announcement was made authoritative astatine 20:15.
It added: "The Chief Veterinary Officer (Scotland) has formed the sentiment that highly pathogenic avian influenza exists, oregon has successful the erstwhile 56 days existed, connected premises and has informed the Scottish ministers of that conclusion.
"This declaration has effect from the day and clip it is made, until it is amended oregon revoked by further declaration."