Two parasitic diseases have devastated oyster farms in western Prince Edward Island, causing massive mortality rates across the region's oyster beds.

The crisis threatens the economic stability of the local aquaculture sector, putting an industry valued at $27 million [1] at risk. Growers are struggling to maintain viable populations as the parasites spread through the water.

The diseases, identified as MSX and Dermo [4], cause high oyster mortality and significantly reduce growth rates. Some growers reported a mortality rate of 100 percent [2], while other reports indicate the parasites are killing a majority of harvested oysters [1].

"We've lost almost every oyster we harvested this season," a PEI oyster farmer said.

In response to the crisis, Canada has approved the import of disease-resistant broodstock from the U.S. to help rebuild the population. Industry representatives from Atlantic Aqua Farms said that importing disease-resistant seed from the U.S. offers a path forward for the industry.

To date, 50 million disease-resistant oyster seeds have been ordered [3] to combat the losses. This effort aims to introduce genetic traits that can withstand the presence of MSX and Dermo.

The Canadian Food Inspection Agency is monitoring the situation. A spokesperson for the agency said, "We are working closely with producers to contain the spread and ensure food safety."

While the agency is investigating the presence of the parasites, some industry sources said that MSX and Dermo pose no risks to human health or food safety.

“"We've lost almost every oyster we harvested this season."”

The emergence of MSX and Dermo in Prince Edward Island represents a critical biological threat to the region's aquaculture. By relying on U.S. imports of resistant seed, the industry is attempting a genetic pivot to ensure long-term survival, though the immediate economic impact remains severe for local farmers.