Canada has become the first country where a genetically modified animal is sold for human consumption, and Canadians may have unwittingly been eating it over the past year.

In its latest earnings statement, AquaBounty Technologies Inc., a U.S.-based biotechnology company that holds the licence to produce the GM fish at a hatchery in the Canadian province of Prince Edward Island, reported that about 4.5 tonnes of "fresh AquAdvantage Salmon fillets” have been sold in Canada in the second quarter of 2017.

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The company did not indicate where the fish is sold or respond to an interview request.

Lucy Sharratt, coordinator of the Ottawa-based Canadian Biotechnology Action Network that has called for mandatory labelling of genetically engineered food, said that while some major Canadian grocery chains have no plans to sell the GM salmon, it could have ended up in smaller stores or on restaurant menus.

“Because there’s no labelling in Canada, Canadians who have been buying salmon, haven’t had a choice,’ she said. “There’s no transparency in the grocery store for Canadians. Canada is an easy market for GM salmon.”