The Newfoundland Aquaculture Industry Association says strict bio-security measures are in place at the unidentified operation in St. Alban's.
Miranda Pryor, the association's executive director, says several different viruses could be involved and it expects results from the federal inspection agency soon.
She says there's no risk to human health or wild fish, just the farmed fish.
Pryor says it's the first time a suspected virus has been found at one of the province's aquaculture sites.
Fisheries Minister Darin King says the provincial government will work closely with the Canadian Food Inspection Agency to address the issue.