To select high-quality frozen fish, the key is to examine the fish's eyes, body surface, anus, the condition of the ice coating, and packaging information. A comprehensive assessment is necessary to select a superior product.
1. Observe the Fish's Eyes
High-quality frozen fish: Eyes are full and protruding, corneas are clear and transparent, black and white are distinct, and there are no impurities.
Inferior frozen fish: Eyes are sunken, cloudy and whitish, or even damaged or reddish, indicating that the fish has been dead for a long time or has been improperly stored.
2. Inspect the Body Surface and Scales
High-quality frozen fish: The body surface is bright in color, the scales are intact, tightly packed, and shiny, and the fish body is firm and undamaged.
Inferior frozen fish: The fish body is dull and yellowish, large areas of scales have fallen off, the skin is loose or has mucus, possibly due to repeated freezing and thawing or spoilage.
3. Check the anus condition
High-quality frozen fish: The anus is tight, intact, and round, without redness, swelling, or discharge.
Inferior-quality frozen fish: The anus is loose, protruding, cracked, or blackened, a typical sign of intestinal putrefaction, indicating the fish is not fresh.
4. Judge the quality of the ice coating
High-quality frozen fish: The ice coating is thin and even, generally no more than 3 mm thick, without cracks or yellowing.
Inferior-quality frozen fish: An excessively thick ice layer (>5 mm) may be for "ice-encasing to increase weight," resulting in actual shrinkage of the fish meat after thawing; large or cracked ice crystals indicate large temperature fluctuations during storage, possibly due to repeated freezing and thawing.
5. Smell to determine freshness
High-quality frozen fish: Before thawing, it should have a faint seawater smell or no odor.
Inferior-quality frozen fish: If it smells of ammonia, rancidity, or rottenness, it indicates that the protein has decomposed and spoiled, and the fish should not be eaten.
6. Check Packaging Labels
Production Date and Shelf Life: Prioritize products with a shelf life of less than 6 months. For high-fat fish (such as salmon), it is recommended to consume within 3 months.
Storage Conditions: The packaging should indicate "freeze below -18℃".
Net Weight and Tare Weight: Pay attention to whether the labeling is clear, avoiding the trap of "more ice than meat".
Chinese Labels and Certifications: Imported products must have Chinese labels, indicating the country of origin, production date, allergens, etc.; prioritize brands with HACCP, ASC, and other certifications.
7. Brand and Channel Selection
Prioritize purchasing from large seafood companies or well-known brands, as their cold chain management is more standardized.
Check delivery reviews when shopping online to ensure end-to-end cold chain transportation; avoid purchasing products with damaged packaging, leaks, or severe frost buildup.
