Genetically Engneered vs Wild (same age)

I'll stick with the wild population. I can't imagine that the big "salmon" is a healthy alternative to the real thing. According to the AP there is a company that is injecting into Atlantic salmon the DNA from another fish species (ocean pout) that make them grow to full size in about 18 months, about twice as fast as regular salmon. The company says that's more efficient since less feed is required. But where is the research that confirms that over the long term such engineering has no deleterious effects on human health?