Title is pretty self-explanatory. I regularly eat high liver, however i have never heard of anyone making "high fish" by just putting some fish in a jar and letting it sit.
To expand a bit, ive been fishing almost every day for the past couple weeks (underwater, not with a rod) and i eat most of what i catch and the rest i give to the cats.
Today while fishing i had the thought of why not trying to do something else with the fish. I have seen stuff like this
https://www.wikihow.com/Ferment-Fish but it just seems unnecessary, thats why im asking if any of you have any experience with making 'fermented' fish in the classical way we know of just leaving meat in a jar.