The Food and Drug Administration on Thursday opened the way for a bevy of genetically engineered salmon, cows and other animals to leap from the laboratory to the marketplace, unveiling an approval process that would treat the modified creatures like drugs. The guidelines for the first time make explicit the regulatory hoops companies would have to jump through to sell engineered salmon that grow twice as fast as wild fish; pigs with high levels of ... omega-3 fatty acids in their meat; or goats that produce ... proteins, such as insulin, in their milk. Many experts ... say the proposed regulations may not go far enough to protect the public. In particular, they argue that the approval process would be highly secretive to guard the commercial interests of the companies involved, and that the new rules do not place sufficient weight on the potential environmental effect of what many consider to be Frankenstein animals. Animals can't be treated exactly like drugs, said Jaydee Hanson, a policy analyst at the Center for Food Safety in Washington. "Drugs don't go out and breed with each other. When a drug gets loose, you figure you can control it. When a bull gets loose, it would be harder to corral." The first product likely to be sold under the new rules is a genetically engineered Atlantic salmon produced by Aqua Bounty Technologies Inc. of Waltham, Mass. Inserted genes from two other fish allow it to reach full size in 18 months rather than the normal 30. Aqua Bounty, along with other biotechnology companies, has been pushing the FDA to establish guidelines and hopes to win approval next year.