As, TD says, everyone is different... and every fish is different. I said rotten fish is bad, that's true most of the times, but it can't be totally excluded that you may like some particular "rotten" fish. If it's appealing to you, then eat it as much as it remains tasty. It's that simple, you don't have to rely on what others say.
Unfortunately my intuition on food,leads me to sufer..i can give some examples..i love fruit..if i could,i would eat it all the time,raw honey with avocafo and raw goat cheese..as far as taste goes and what is apealing to my senses, fruit,honey and dairy beat any other food..unfortunately, if i eat those,i wont be able to move for almosy 3 weeks..fructose will acumulate in my liver,intestines and kidneys, and will have to eat non apealing raw eggs, until they cleanse acumullated fructose..(hereditary fructose intolerance)..with dairy ,its the same, and i dont know why..maybe im allergic, dont know..i love it tough.. So, these days i dont vare about taste..it would be for the bacteria that i would eat rotten mackerel..my worries are on histamine..if some species are dangerous to eat rotted (raw) while others are ok..guess i'l have to try and see for myself