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According to EatByDate, fish stays fresh in the refrigerator for 1 to 2 days. However, proper storage in an airtight container is key to preserving fish and keeping it fresh. Cooked fish has a slightly longer shelf life of around 5 to 7 days. Continue Reading.
Fatty fish like salmon and tuna should keep at top quality for 2-3 months, while lean fish like cod and catfish will keep well in the freezer for up to 6 months.atty fish like salmon and tuna should keep at top quality for 2-3 months, while lean fish like cod and catfish will keep well in the freezer for up to 6 months.