I never ate fish, I always disliked the smell and had a little bit of trauma with my father forcing me to eat it while I was a kid. I had two experiences:
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Some years ago, I tried sushi. It doesn't have a strong smell of fish and I found it edible. But there is a very faint smell of fish.
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Some days ago, I bought some chips made of Nori algae. They were vegan chips and yet, I felt the same soft smell of fish.
I conjectured that perhaps, part of this smell is common to all things in the sea. Lately, I decided to do indoor farming and when studying about fertilizers, I heard someone saying that "certain fertilizers with phosphorus have a smell of fish and that the sea is rich in phosphorus" so, this seems to be my first guess. I understand that my question is a bit vague.
Best Answer
The American Society for Nutrition explains it thus:
This trimethylamine is something that is produced in small quantities by our own gut microbes, and usually is no trouble when kept under control - some however are unfortunatley prone to "Fish Odour Syndrome".
Bolding Mine
Conclusion.