How long does uncooked fish stay in the refrig?

That depends upon the temperature setting of the refrigerator and the condition of the fish when placed in the refrigerator.

Plan to store fish close to freezing and use within 1-2 days of purchase. Depending on the fridge temperature and exterior climate, fish can be refrigerated maximum for a couple of days in mild weather, maybe even hours in tropical zones, before it will start to decompose. If you freeze the fish it will stay eatable for a couple of weeks, again depends on the freezing temperature. Some restaurants and plants in the seafood industry have cryogenic freezing technology, that can keep fish fresh for months, even years. 3 days.