It's only ever been palatable twice in my life - as plain white fish at a chinese restaurant with a lot of soy sauce and other stuff. It's probably neutralising a chemical that triggers my warning systems.
My girlfriend finds all forms of fish and seafood distasteful - fresh water fish, salt water fish, shellfish, the lot. In almost all instances she finds it nauseating, even the smell from a distance.
I've not previously encountered anyone with such a broad dislike for seafood. I'm curious what your experiences are.
My personal belief is that I am extremely sensitive to one of the chemicals that shows up as fish gets old. I smell it much better and earlier than most people so even "fresh" fish smells like it should be thrown out. On the plus side, I can tell you which shops have the freshest fish :) One near us had nearly no smell, so it must have been good.
One of the stories my wife remembers is when we asked at a Chinese restaurant about whether the stir fried green beans had any seafood (they often have rice-sized dried shrimp). We were told no. I smelled it coming when they were a few tables away from us still, but the others at the table couldn't smell a thing and had to look very closely to confirm.
Editing to add: I'm not unadventurous or anything of the sort - I even like durian! But people seem to constantly think I just need to get used to an unfamiliar flavour.
No other pelagic white fish, just cod.
1: https://www.skinnytaste.com/cream-of-zucchini-soup-1-ww-poin...