When you eat any type of seafood like fish, it is imperative to eat it fresh because seafood such as fish can rot faster. The best is to have it the day you purchase it. But in case you don’t want to eat the fish on that same day, then be certain that you keep the fish in the freezer. If you want to thaw that fish, make sure that you leave it in water. But if you leave that on the sink, then it can possibly lose its all nutritional values.