The nation's two largest conventional grocery chains, Kroger and Safeway, have announced that they will not sell genetically engineered salmon. They join several other chains, including Target, Whole Foods ... and Trader Joe's. The Food and Drug Administration has not yet decided whether to approve the salmon, with DNA retooled so that the fish grow twice as fast as conventional salmon. The FDA's final decision on the fish has been expected for a long time, and there is speculation that the agency has been holding off mainly because it knows that the public is inclined to look suspiciously on the new product. Consumer groups have taken matters into their own hands by appealing to food markets not to carry the fish, and they're obviously having some notable successes. The other markets should fall in line; they don't need these salmon in their fish departments in order to succeed, and, in fact, they stand a good chance of turning off consumers who worry about making over the DNA of an animal that, for all the fish farms, is essentially a wild creature.