Whether most of us like it or not, GMO's are already here and will be here to stay. It is a reality of increasing populations and less land available which drives the need for alternative ways to create more food with less land. Even our family gardens have long ago fallen under the realm of GMO's with the creation of hybrid vegetables. For hundreds of years, hybrids were genetically modified by selectively crossing plants with desirable traits generation after generation until the desired end result was obtained. Modern times we do the same thing but in a much shorter time frame with microscopes and a laboratory.
So should we be afraid of a genetically modified salmon which has been making the news lately? Not if you are planning on eating it. What we should be worried about and what I haven't seen in the news is what happens when these GMO salmon get out into our food stream unchecked and able to procreate? Granted these salmon would be raised only in specific inland specially designed ponds but mistakes and slip ups happen. What then? Perhaps they will thrive and live in harmony with the fish that they improved upon. Perhaps they become the next zebra mussel or kudzu plant. That should be our true concern.