The ISA virus was found in all the samples submitted.
Of the 411,410 fish susceptible, 6,900 cases were reported which led to 1,830 deaths and two destroyed.
The Food Safety Authority is now working to create a control area, comprising of a control zone and a surveillance zone, around the affected farm.
Other farms in the area have been notified and those living and working in the area have been asked to show care and caution to prevent the spread of the disease.
The source of the outbreak is unknown.