The fish in the spotlight is the AquAdvantage salmon, produced by Massachusetts-based AquaBounty. The Atlantic salmon contains a growth hormone from a Chinook salmon and a gene from the ocean pout -- a combination to help it grow large enough for consumption in 18 months instead of the typical three years.
Activists and commercial fishermen have raised concerns about whether the fish is safe to eat and whether potential environmental harms could unfold if any of AquaBounty's salmon ever made their way into ocean waters and mated with wild salmon. The company has argued that its fish, which are all female, sterile and raised in land-locked facilities, actually could reduce pressure on wild stocks and prevent the over-fishing of Atlantic salmon. FDA has said its approval was "based on sound science and a comprehensive review" and that regulators are confident the genetically altered fish is safe to eat.
The agency said last month it could require additional labeling of genetically engineered foods only if "there is a material difference -- such as a different nutritional profile" between the genetically engineered food and its natural counterpart. In the case of the AquaAdvantage salmon, FDA found no such differences.
But the language in the federal spending bill, which is expected to soon pass Congress, directs FDA to prevent the AquaBounty salmon from reaching the U.S. market until regulators finalize labeling guidelines. It also directs them to spend "not less than $150,000" undertaking the effort.
"There's a question as to whether this fish should even be called a salmon," said Sen. Lisa Murkowski (R-Alaska), who pushed for the additional language. "The FDA made no mandatory labeling requirement. Instead, they said it could be labeled voluntarily. But no manufacturer of a 'Frankenfish' is going to label it as such. ... At least now people will have the opportunity, the chance, to know what it is that they are purchasing."
Lisa Archer, director of the food and technology program at the Friends of the Earth, said the advocacy group would continue to keep pressing to have labels on all genetically modified foods, but the salmon provision was a good start. "The vast majority of people want GMO labeling, and Friends of the Earth and our allies will continue to fight for our basic right to know what we are feeding our families," she said in a statement.
AquaBounty did not immediately respond to a request for comment.
Despite the language in this week's federal spending bill, it remains unclear when and where genetically modified salmon might show up for sale.
Knowing FDA likely would approve the AquaBounty salmon, consumer and environmental activists have in recent years convinced some of the country's largest retailers not to stock it. Chains such as Whole Foods, Trader Joe's, Costco and Target have said they will not sell the controversial fish.
This post has been updated.