Yeah, fish farming as a whole needs considerably better regulation (not to mention enforcement of that regulation, as Norway's industry has shown again just recently) to be considered a decent alternative, but there are still farms that at least try to be ethically defensible. It varies considerably from one farm ownership to another.
Wild fishing is more just a concern about managing wild populations and not using trawlers (or nets in general, preferably), which can generally be checked up on. Trawlers have also been going somewhat out of style with more awareness and regulations surrounding them. There's always mercury, particularly in bigger predators (and this is notably a big concern to people in the Faroe islands), but that's more the fault of land-based industries being shitters. Shitting where shitting is due.
Free range is fine, if it's actually free range... Which is complicated, due to its official definition as per the FDA perhaps not being entirely what John Q. would naturally assume. Dairy is also fine if the animals are properly taken care of in general (which, again, varies considerably). Dairy cows are in kind of the same position as domestic sheep in that their bodies don't regulate their production like a wild animal's would, so you're not "stealing" a calf's milk or necessitating a painful separation of mother and calf. It can be difficult finding ethical cattle farms though, due to the large area needs.