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This article was written by Lisa Jackson and originally published by Global Seafood Alliance on August 13, 2024 at 7:13PM ADT. We are sharing the full text here for reference. All rights remain with the original publisher.

MSX parasite detected in oysters from Bedeque Bay, P.E.I. for first time,  ‘devastating news’ for the local oyster industry

The deadly MSX parasite has been detected in oysters from Bedeque Bay, P.E.I., threatening the local oyster industry. Photo by Mark Stebnicki.

A deadly disease has been detected in wild oysters from Bedeque Bay, Prince Edward Island (P.E.I.), which could threaten the local oyster industry. Multinucleate sphere X (MSX), caused by the parasite Haplosporidium nelsoni, affects oysters by slowing their growth and increasing mortality rates, but it does not pose any risk to human health or food safety.

In June, oyster harvesters raised concerns with provincial authorities after noticing an unusual spike in oysters dying. The Canadian Food Inspection Agency (CFIA) analyzed samples and confirmed the presence of the MSX parasite.

“The presence of MSX in oysters in Bedeque Bay is devastating news for our province,” said Cory Deagle, minister of Fisheries, Tourism, Sport and Culture, in a written statement. “It isn’t just about the impact on our oyster industry, it is about the livelihood of Islanders, their families and our communities. The Island’s oyster industry is part of our culture and tradition.”

Oysters with MSX typically start dying at around two years old, which is when they reach market size. Affected oysters may be slow to close their shells, appear thin and watery when opened and have brown spots inside the shell.