Government regulators moved a big step closer on Friday to allowing the first genetically engineered animal — a fast-growing salmon — to enter the nation’s food supply.

The Food and Drug Administration said it had concluded that the salmon would have “no significant impact” on the environment. The agency also said the salmon was “as safe as food from conventional Atlantic salmon.” While the agency’s draft environmental assessment will be open to public comment for 60 days, it seems likely that the salmon will be approved, though that could still be months away.

The environmental assessment is dated May 4. It is unclear why it took until now for it to be released, but supporters of the salmon say they believe it is because the Obama administration was afraid of an unfavorable consumer reaction before the election in November.

Environmental and consumer groups quickly criticized the federal agency’s conclusions.

“The G.E. salmon has no socially redeeming value,” Andrew Kimbrell, executive director of the Center for Food Safety, a Washington advocacy group opposed to farm biotechnology, said in a statement. “It’s bad for the consumer, bad for the salmon industry and bad for the environment. F.D.A.’s decision is premature and misguided.”