Freezing at -18°C or below, sealing to prevent odor transfer, and avoiding repeated thawing are the core storage conditions for frozen fish. Under standard conditions, most fish can be safely stored for 3 to 6 months. Fish with high fat content (such as salmon) are recommended to be consumed within 2 to 3 months, and vacuum packaging can extend this to 12 months.
According to food safety standards, the temperature of a household freezer should be kept stable at -18°C or lower to inhibit bacterial growth and enzyme activity, maintaining the quality of the fish. Although theoretically safe to consume within the shelf life, frequent start-ups and shutdowns of the refrigerator during actual storage can cause temperature fluctuations, accelerating protein denaturation and fat oxidation, affecting taste and nutrition.
The correct storage steps include:
Pre-treatment: Before freezing, the fish should be thoroughly cleaned, drained, and the internal organs and black membrane (the source of fishy odor) removed. The silvery membrane on the surface of ribbonfish should be removed by dry wiping with kitchen paper.
Portioning and Sealing: Portion the fish into single-serving portions using food-grade freezer bags or vacuum packaging, minimizing air exposure to prevent freezing damage and shrinkage.
Quick Freezing: If possible, quickly freeze the fish at -25°C or below to rapidly lower the core temperature to -15°C, reducing ice crystal damage to cell structure and maintaining firm texture.
Preventing Odor Transfer and Contamination: Store raw and cooked foods separately to avoid cross-contamination; frozen fish should also be kept away from foods with strong odors.
Thawing Method: It is recommended to thaw the fish slowly in the refrigerator beforehand to avoid bacterial growth during room temperature thawing; avoid repeated freezing and thawing, as this will severely damage the texture and increase safety risks.
