http://www.stallman.org/archives/2010-jul-oct.html#9%20September%202010%20%28Risky%20business%3A%20GM%20salmon%29
9 September 2010 (Risky business: GM salmon)</p>
Are
genetically engineered salmon
dangerous?
The disgust about mixing genes from different species is
irrational, but there are some real issues here.
Salmon spawn in places that are far upstream — nowhere near fish
farms. Does this make it impossible for the modified gene to get into wild
salmon? I am not sure. If it can't leak from the farms, it might get into a
wild population through a unexpected route. Living organisms occasionally
do things that surprise us.
Wild salmon must have evolved the gene that turns off growth hormone
for part of the year, so the artificial gene might be selected against. If
so, it would disappear from the wild population even if it were introduced
there. However, it is hard to be sure of this based on theoretical arguments,
because they lead to probabilities rather than certainties.
The issue about exposing humans to extra IGF-1 might be a real one. The
crucial question is, if you eat a lot of this salmon, how much IGF-1 would
you get, and is that enough to have a significant effect? The amount of
effect from eating salmon might be either more or less than the effect of
drinking cow's milk — I don't know. The point is one cannot assume the
two cases are parallel.
What we do know is that children tend to drink a lot of milk, but they
don't tend to eat a lot of salmon.