retail news in context, analysis with attitude

The Washington Post reports that the federal spending bill that seems certain to be signed into law by President Obama includes instructions to the US Food and Drug Administration (FDA) "to forbid the sale of genetically engineered salmon until the agency puts in place labeling guidelines and 'a program to disclose to consumers' whether a fish has been genetically altered. The language comes just a month after FDA made salmon the first genetically modified animal approved for human consumption and represents a victory for advocates who have long opposed such foods from reaching Americans' dinner plates. At the very least, they say, consumers ought to know what they are buying."
KC's View:
Not being a scientist, I have no idea why GM technology makes a difference with fish but not with crops. I'm sure there is a good reason, but if the government were consistent, wouldn't it require that non-GM< salmon carry the labels?