You should know how to identify whether frozen fish is terrible to prevent wasting money on bad seafood. Checking the sell-by date is often the easiest to know if frozen seafood is terrible. It will quickly deteriorate after this day has passed. If the sell-by date has gone, the fish should be discarded. The fish may even have a use-by date printed on the package. The frozen fish will spoil if it is not consumed by this date.
The appearance of a fish is one of the essential factors in determining whether or not it is terrible.