When it was revealed over the summer that genetically modified salmon was now being sold in Canada, the backlash from anti-GM environmental groups was fierce. The source of the stink was a two-line disclosure in the quarterly earnings of AquaBounty Technologies, a US biotech company, which stated it had sold a small amount of its AquAdvantage salmon. Engineered to grow at twice the rate of regular salmon, it is also believed to be the first example of a genetically engineered animal bred and sold for human consumption. The road to market has certainly been a long one. AquaBounty won approval to sell in Canada in 2016 after a six-year wait. But obtaining the green light from regulators is only one part of the story. Many consumer and environmental groups remain outright opposed to GM salmon being sold at all. Although the AquAdvantage salmon are all sterile, a common concern is that fertile GM species could escape into the wild and hurt natural species by interbreeding or beating them in the competition for resources.