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How long does it take for a fish to die before it can still be eaten?

Not edible.

If the time after the death of aquatic fish is too long, the fish meat will rot, produce bacteria and toxins, and cannot be eaten. The freshness of fish meat is one of the key factors to ensure food safety and taste. When a fish dies, the protein begins to break down and bacteria multiply rapidly, causing the fish meat to deteriorate. More than 2 hours after the death of an aquatic fish, the fish meat has begun to deteriorate and is no longer suitable for consumption.