I have eaten live freshwater fish when I travelled down South areas of Sri Lanka. It's more tasty after fried. Usually we connot buy live fish from the market or street sellers. After cut slices of fish, very deserve to add turmeric powder, salt, pepper and chili powder and seasoned. After few minutes later fry seasoned live fish. It was our recipe of my previous travel experience.
Ya, adding a bit of pepper and chili will make it more spicy and tasty as well - we usually don't eat chili.