The Food and Drug Administration says it's safe, but two supermarket chains say they don't want genetically modified fish in their stores. Both Trader Joes and Whole Foods Market said they will not sell a new type of genetically-engineered salmon when it receives FDA approval.
It's a cross between an Atlantic and Pacific salmon and can grow twice as fast as regular salmon.
The FDA says the genetically modified salmon won't cause health problems or harm the environment. Critics say it could threaten other salmon if it gets into the wild.