Evolution happens because our DNA reacts over millions of years to all sorts of influences of which what we eat will be one of them, of this I am sure.
Over millenia our DNA adapts to the changes in our environment and our "prey" items as determined by nature. Short term changes to our environments have been shown to be bad, take asthma, exzema, autism, etc. These genetic conditions are thought to be a direct result to the extra pollutants we encounter everday.
What happens when the DNA changes in our "prey" items accelerates faster than evolution allows our bodies to adapt with the changes?
What happens when our evolution is no longer in sync with our "prey" items?
The only real answer is no one knows unless they do proper research over decades. Surely past lessons has taught the science community to aire on the side of caution with such large experiments. Taking the proper amount of time to study things in-depth could save a lot of heartache and probably money further down the line.
However, I am sure the company with the most money will tell the various governments to tell us what will happen after decades of life.
Money talks and secretly poorer families in society will be the guinea pigs, and the companies will be watching and taking notes, because they will be the ones who are ultimately left with little or no choice over what type of salmon they want to eat because of how much natural salmon's price will sky rocket.
