Not an issue. It'd be like if a cow or duck or pigeon became a cannibal carnivore. It's not the natural order of the creature, andimals have a role in the environment and whn it changes is anyway, it harms the environment. Hopefully G-d helped me make this make sense.
The only meat I eat is fish. It's not that I have anything against eating animals but I don't trust anybody's Kashrut anymore, and I don't trust the quality of meat produced from factory farming. For the same reason, I don't eat dairy. I try to only eat "free range" eggs because the process is more humane. I don't care about free range per se, and I'm quite aware that free range isn't really free range, but the point is that the so-called free-range chickens are treated better. I'll only eat their eggs, because I also have a problem with their Kashrut and not to mention the quality of the meat, which is very fatty and has many resistant bacterias due to overdosing with antibiotics.
That being said, I'll eat any fish. I don't really care if they're farmed or wild or what they taste like, only how nutritious they are. Of course I prefer wild-caught salmon, but a whole wild-caught salmon goes for on-average between $80 to $120.