The government illegally approved a breed of genetically engineered salmon without assessing the harm the fish might cause if they escaped their confines and interbred with other salmon species, a federal judge ruled. The Food and Drug Administration agreed in 2015, under President Barack Obama's administration, to allow AquaBounty Technologies to produce the fish, which is an Atlantic salmon that has been infused with a growth hormone gene from Pacific salmon, also known as chinook, and DNA from a slithery creature known as an eelpout. But U.S. District Judge Vince Chhabria of San Francisco said the FDA had failed to consider or study what would happen if the genetically engineered salmon slipped out and reached waters inhabited by other salmon. "They may directly interact with wild salmon, such as by mating or simply by competing for resources," Chhabria said in a ruling on a lawsuit by environmental, consumer and fishing organizations. "Even if this scenario was unlikely, the FDA was still required to assess the consequences," especially since the agency knew AquaBounty's facilities were likely to grow, he said. "Before starting the country down a road that could well lead to commercial production of genetically engineered fish on a large scale, the FDA should have developed a full understanding " and provided a full explanation " of the potential environmental consequences," Chhabria said. The FDA did not say whether it would appeal the ruling.