Thawing Fish It is best to thaw fish in their wrappings in the refrigerator allowing 18-24 hours per pound. If you need to thaw fish more quickly, you can place it in an airtight wrapper and under cold water allowing one to two hours per pound. It should be cooked while still chilled. Prepare defrosted fish in the same manner as fresh fish. If the fish is only partially thawed, allow additional cooking time at a lower temperature. Frozen fillets and steaks do not have to be thawed before cooking, provided additional time is allotted. However, if you plan to bread or stuff fish, it should be thawed first. Cooked fish may be stored in the freezer or in the refrigerator. To freeze, the cooked fish should be packed in a moisture-vapor-proof material and stored not longer than three months. To refrigerate, the cooked fish should be placed in a covered container and used within three days. Caution! When defrosting fish remember never to thaw at room temperature, in hot water, or refreeze frozen fish.