How Long Canned and Fresh Tuna Stays Safe in Your Refrigerator

Fresh tuna lasts three days in the coldest part of your refrigerator; canned tuna lasts three to five days after opening

The shelf life depends on what form of tuna you have and whether the package has been opened. Fresh tuna steaks or fillets should be used within three days of purchase if stored at 40°F or below — the temperature your refrigerator should maintain. Canned tuna that has been opened and transferred to a container lasts three to five days under the same conditions. Unopened canned tuna keeps for years in the pantry, but once you open it, the clock starts.

The difference comes down to how quickly bacteria multiply once the protective seal is broken or the fish is exposed to air. Fresh tuna has more surface area and higher moisture content, making it a faster target for spoilage. Canned tuna in oil or water is more stable after opening because the liquid provides some protection, but it still needs cold storage to stay safe.

Key Takeaways

• Fresh tuna fillets and steaks should be cooked or frozen within three days of purchase; store them on the lowest shelf where it is coldest.
• Canned tuna opened and transferred to a covered container lasts three to five days in the refrigerator.
• Keep canned tuna in its original liquid or transfer it to an airtight container to slow oxidation and drying.
• If you buy fresh tuna and do not plan to cook it within two days, freeze it immediately for later use.

Where to store fresh tuna so it lasts the full three days

The coldest spot in your refrigerator is usually the back of the bottom shelf, away from the door. Place fresh tuna there in its original packaging or wrapped tightly in plastic wrap or butcher paper. Do not store it in the door, where temperature fluctuates every time you open the refrigerator — that speeds spoilage.

If your tuna came vacuum-sealed from the market, leave it sealed until you are ready to cook. Once you open the package, the fish begins to oxidize and dry out. If the package is leaking or the seal is broken when you get home, cook the tuna that day or freeze it immediately.

Keep tuna away from ready-to-eat foods like deli meat and leftovers. Raw fish can drip onto other foods and introduce bacteria. Use a separate shelf or place the tuna on a plate to catch any liquid.

How to store opened canned tuna

Do not leave canned tuna in the open can once you have opened it. Transfer the contents to a glass or plastic container with a tight-fitting lid. This slows oxidation, which causes the tuna to dry out and develop a metallic or off taste.

If you want to keep the tuna in its liquid (oil or water), pour the liquid into the container with the fish. The liquid acts as a barrier against air exposure. If you drain the liquid to reduce calories or fat, the tuna will dry out faster — plan to use it within two days instead of five.

Label the container with the date you opened it. Three to five days is the safe window; after that, discard it even if it looks and smells normal. Canned tuna that has been open longer can harbor bacteria that do not produce obvious signs of spoilage.

Signs that fresh or canned tuna has gone bad

Fresh tuna that is no longer safe to eat will have a strong, unpleasant fishy or ammonia-like smell. The flesh may look dull, slimy, or discolored — gray or brown instead of the bright pink or red of fresh fish. If you press the flesh with your finger, it should spring back; if it leaves an indent, the tuna is breaking down.

Canned tuna that has spoiled may smell sour or off, or the liquid may look cloudy. If the can itself is swollen or bulging, do not open it — that is a sign of bacterial gas production inside. Discard the entire can.

Trust your senses. If something smells or looks wrong, throw it out. The risk of foodborne illness is not worth the cost of a can of tuna.

Freezing fresh tuna to extend its life

If you know you will not cook fresh tuna within two days, freeze it as soon as you get home. Wrap it tightly in plastic wrap, then place it in a freezer bag to prevent freezer burn. Label it with the date. Frozen tuna keeps for two to three months.

Thaw frozen tuna in the refrigerator overnight, never at room temperature. Once thawed, cook it the same day — do not refreeze it. Thawing at room temperature or in warm water allows bacteria to multiply on the surface while the inside is still frozen.

Freezing does not improve the texture of tuna the way it does for some fish. The ice crystals that form can make the flesh slightly softer when cooked. But frozen tuna is still safe and tastes good, especially in dishes like tuna salad or casseroles where texture is less critical.

The difference between fresh tuna and canned tuna storage

Fresh tuna is raw fish with a short shelf life because bacteria colonize the surface quickly once it is cut or packaged. Canned tuna has been cooked and sealed in a sterile environment, which kills most bacteria and extends its pantry life to years. The moment you open the can, you break that seal and introduce air and potential contamination.

This is why canned tuna lasts longer than fresh tuna after opening — it has already been heat-treated. But it still needs refrigeration once opened because the protective seal is gone. The three- to five-day window is the same safety standard the USDA recommends for most opened canned seafood products.

Organizing your refrigerator so tuna stays fresh longer

Keep your refrigerator at 40°F or below. Use a refrigerator thermometer to check — many refrigerators run warmer than their dial suggests, especially in the door and on upper shelves. If your fridge is warmer than 40°F, tuna will spoil faster.

Store fresh tuna on the lowest shelf, where cold air settles. Keep it separate from other foods to prevent cross-contamination. Store canned tuna in a cool, dry spot in the pantry before opening; after opening, move it to the coldest part of the refrigerator in a covered container.

Do not overcrowd your refrigerator. Air needs to circulate around food to keep it cold evenly. If your fridge is packed, some areas will be warmer than others, and tuna stored in a warm spot will spoil faster.

Frequently Asked Questions

Can I eat canned tuna that has been open for a week?

No. Canned tuna should be discarded after five days of refrigeration once opened. After that point, bacteria can grow to unsafe levels even if the tuna looks and smells fine. It is not worth the risk of food poisoning.

Is it safe to cook fresh tuna on the third day if it smells a little fishy?

A mild fishy smell is normal for fresh tuna, but a strong ammonia or sour smell means it has spoiled. If you are unsure, do not cook it. Cooking will not make spoiled fish safe to eat — the bacteria and toxins are already present.

What if I forgot to transfer canned tuna to a container and left it in the open can overnight?

If the can was covered or the tuna was not exposed to air for long, it is probably still safe. Transfer it to a container now and use it within the next two to three days. If it was left uncovered for hours or overnight, discard it to be safe.

Does tuna in oil last longer than tuna in water?

Slightly. The oil provides a barrier against air exposure, so tuna packed in oil may last toward the five-day end of the range, while tuna in water may be better used within three days. Both should be transferred to a covered container after opening.

Can I freeze canned tuna after opening it?

Yes, but the texture will change when thawed — it becomes softer and more crumbly. Frozen canned tuna works well in tuna salad, casseroles, or pasta dishes where texture is less important. Thaw it in the refrigerator and use it within a day of thawing.