How Long Does Tuna Last Once Openedに関する深掘り記事を速報でお届けします。関心のある方は必見です。

Once you break that airtight seal, the tuna’s shelf life shrinks dramatically. In the refrigerator, opened tuna—whether canned, pouched, or jarred—lasts three to four days. That’s it. You’ve got a narrow window of enjoyment before quality and safety start to slide.

This applies to both water-packed and oil-packed varieties, though oil can sometimes slow down spoilage just a hair. The USDA is firm on this benchmark, and professional kitchens treat it like gospel.

Fun fact: The canned tuna you buy today was likely caught, cooked, and sealed within hours of being hauled aboard a fishing vessel. That freshness is a gift—but it also means the clock starts ticking the second you open it.

Storage Tips That Actually Matter

Don’t just toss the open can or pouch into the fridge—that’s a rookie move. Transfer leftover tuna into an airtight glass or plastic container. The metal can itself can impart a metallic taste once exposed to air, and the thin lid won’t seal out moisture.

Press a piece of plastic wrap directly onto the surface of the tuna before closing the lid. This minimizes air exposure, which is the primary enemy of both flavor and texture. Your tuna stays moist and doesn’t start oxidizing into something that tastes like a distant memory.

Pro tip: If you’ve mixed your leftover tuna with mayonnaise, yogurt, or any dressing, the shelf life drops to two to three days. Those ingredients are dairy or egg-based, and they spoil faster than plain tuna.

How Long Opened Canned Tuna Lasts In the Fridge