By virtually all metrics, intensive land-based animal farming is much harder on the environment. Also, in terms of animal welfare, its super sketchy even with animals labeled organic.

The misinformation around fish farming is absurd. I think people want to believe in the myth that commercial fishing is a couple guys in a wooden boat; when its actually a floating factory discarding up to half or more of what it kills.

There are many aquatic things I won't eat but mostly it is of the "wild fish" variety (overfishing, pollution, mercury, bycatch). I worked a single season as a fisheries observer in Alaska. The destruction was maddening.

I put wild fish in quotes because many times they are raised in a hatcheries then released into the wild. Which has ruined the gene pool of salmon in places that do this.

After a few years raising chickens at my home farm, I became pescatarian. I drew an arbitrary line at intelligence where I wouldn't eat anything as smart or smarter than a chicken.

Anyhow, avoiding farmed fish while eating land meat is really misinformed. I think the meat industry and commercial fishing industries have managed to completely misinform the American public (and a few well-meaning but misleading documentaries on the subject).

America doesn't not farm very many aquatic things besides oysters, trout and catfish. Which are all very very green industries. I like to bring these ones up in conversations about this topic.