Whole Foods Market, Aldi and Trader Joe’s Co. are among retailers who have pledged not to sell genetically engineered salmon or other seafood, according to a new advocacy campaign.

The Campaign for Genetically Engineered-Free Seafood – a coalition formed by the Consumers Union, Friends of the Earth and other groups – announced Wednesday that food retailers representing 2,000 U.S. stores have vowed not to sell GM seafood if it is approved in the United States. The announcement was made as the U.S. Food and Drug Administration appears close to approving genetically engineered salmon from AquaBounty Technologies, Maynard, Mass.

In December the FDA announced a draft environmental assessment indicating the genetically engineered salmon from AquaBounty – called AquaAdvantage – would not have a significant impact on the U.S. environment. The salmon would be farmed in Panama.

AquaBounty formally applied for approval of the GM salmon in 1995. Last month the public comment period was supposed to end, but the FDA extended the deadline to late April. If approved, the salmon would become the first genetically engineered animal to enter America’s human food supply.