Under ideal storage conditions-constant freezing below -18℃, airtight sealing to prevent oxidation, and portioning to avoid repeated thawing-frozen shellfish can generally be safely stored for 3 to 6 months, with some low-fat varieties even exceeding 8 months.
The specific storage time varies depending on the type of shellfish, its fat content, and its initial quality:
1. Low-fat shellfish (such as clams, mussels, and oyster meat): Under well-sealed and temperature-stable conditions, they can be stored for 3-6 months.
These shellfish are high in protein and low in fat, making them less prone to oxidation and spoilage. The main risks come from slow microbial activity and a decline in taste due to freezing damage.
2. High-fat shellfish (such as some scallops and frozen abalone): It is recommended to consume them within 2-3 months.
Shellfish with higher fat content are more prone to fat oxidation, which is difficult to completely inhibit even at low temperatures. Prolonged storage can lead to "oil burning," manifested as surface browning and a clam-like taste, affecting both flavor and nutritional value.
3. High-end shellfish that are cooked and frozen or frozen on board: If processed immediately on board and flash-frozen at ultra-low temperatures (e.g., -35°C), the shelf life can be extended to 6-8 months.
This process allows for rapid passage through the maximum ice crystal formation zone, minimizing cell damage. After thawing, the shellfish has a near-fresh texture and is suitable for long-term storage.
