Well, since salmon is my very very favorite fish for dinner and since Frankentein food is one of my worst nightmares, I am decidely not dreaming of GM salmon on my din din menu. And their increased size is hardly the issue.
In fact, this sounds like a lousy gene-altering idea to me.
How does it sound to you, little Spotted boxfish?

(He doesn't look remotely interested, does he? But every salmon-eating bi-ped should be.)