Opened anchovies keep for up to two months in the refrigerator, as long as the fillets stay fully submerged in oil and sealed in an airtight container. That timeline stretches even longer for salt-packed varieties stored under a generous layer of salt. The key to both types is minimizing air exposure, which is simpler than it sounds once you know the steps.
Transfer Out of the Tin Immediately
The first thing to do after opening a tin of anchovies is move the leftovers into a different container. A small glass jar with a tight lid is ideal. Leaving fish in an open tin allows the metal to leach into the food, giving the anchovies a noticeable metallic taste. The USDA confirms that while it’s technically safe to refrigerate food in the original can, flavor is better preserved in glass or plastic.
Choose a container that’s close in size to the amount of anchovies you have left. A small jar means less air sitting above the oil’s surface. If you only have a few fillets, a half-pint mason jar or even a clean jam jar works perfectly.
Oil-Packed Anchovies: Keep Them Submerged
For oil-packed anchovies, the oil is your preservative. Every fillet needs to be completely covered. If the leftover oil from the original tin isn’t enough to submerge everything in your new container, top it off with regular olive oil until the fish disappears beneath the surface. Any fillet poking above the oil line is exposed to air and will spoil much faster.
Stored this way in the fridge, oil-packed anchovies stay good for one to two months. Some cooks push this even longer, reporting that fully submerged fillets last indefinitely with periodic oil top-offs. The conservative USDA guideline for opened canned fish is three to four days, but that assumes the fish is simply refrigerated without any oil seal. The oil barrier changes the equation significantly by cutting off oxygen and slowing bacterial growth.
One thing you’ll notice: the olive oil solidifies and turns cloudy in the fridge. This is completely normal. Just pull the jar out 10 to 15 minutes before you need it, and the oil will loosen back to its liquid state at room temperature.
Salt-Packed Anchovies: Pile On More Salt
Salt-packed anchovies follow a different logic. Instead of oil, coarse salt is the barrier. After you remove the fillets you need, push the remaining fish back down into the salt and add more on top so everything is well buried. Transfer to a jar or airtight container if the original packaging doesn’t reseal well.
Salt-packed anchovies stored this way last for several months in the refrigerator. The salt draws moisture out of the fish and creates an environment where bacteria struggle to grow. As long as the salt layer stays thick and the container stays sealed, these are remarkably shelf-stable even after opening.
Storing Anchovy Paste
Anchovy paste in a tube is the most forgiving format. Opened and refrigerated, it holds its quality for 6 to 12 months. The trick is managing air inside the tube. After each use, roll the empty end of the tube toward the cap, pressing out as much air as possible before sealing it. Think of it like a toothpaste tube you’re trying to get every last bit from, except you’re doing it for freshness rather than frugality.
Cap the tube immediately after squeezing out what you need. Oxidation starts the moment the paste hits air. Store the tube in the main body of the fridge rather than the door, where temperature fluctuates more. Writing the opening date on the tube with a marker helps you track how long it’s been.
For anchovy paste in a jar, add a thin layer of olive oil on top of the paste after each use. This creates the same kind of oxygen barrier that keeps whole fillets fresh. Use a clean, dry spoon every time you dip in.
Freezing as a Backup Option
If you know you won’t use your anchovies within a couple of months, freezing works. Lay individual fillets on a parchment-lined plate or tray and freeze them until solid, then transfer to a freezer bag with the air pressed out. This way you can pull out one or two fillets at a time instead of thawing the whole batch. Frozen anchovies keep for several months, though the texture softens slightly after thawing. That makes them better suited for cooking into sauces, dressings, and pasta rather than eating straight.
How to Tell They’ve Gone Bad
Anchovies are already pungent, so the smell test requires some calibration. Fresh-from-the-jar anchovies have a strong, briny, fishy smell that’s intense but clean. Spoiled anchovies shift toward something sharper and more unpleasant, often with an ammonia-like edge that’s distinct from their normal funk.
Beyond smell, look for visual and texture changes. Fillets that have darkened significantly, developed a slimy coating, or feel unusually sticky have started to break down. If the oil has turned murky or developed an off smell of its own, that’s another warning sign.
There’s also a less visible risk worth knowing about. Fish that sits at room temperature can develop dangerously high levels of histamine through bacterial activity, a process that can produce toxic levels in as little as 6 to 12 hours without refrigeration. The FDA notes that these toxins aren’t destroyed by cooking, freezing, or curing. This means anchovies that were left out on the counter overnight shouldn’t be rescued by tossing them back in the fridge. Once the temperature abuse has happened, the damage is done even if you can’t see or smell it yet.
Quick Reference by Type
- Oil-packed fillets: Transfer to a glass jar, submerge in oil, refrigerate. Good for 1 to 2 months.
- Salt-packed fillets: Keep buried in salt in a sealed container, refrigerate. Good for several months.
- Anchovy paste (tube): Roll out air, cap tightly, refrigerate. Good for 6 to 12 months.
- Anchovy paste (jar): Top with olive oil, seal, refrigerate. Good for 6 to 12 months.
- Frozen fillets: Freeze individually, then bag. Good for several months, best used in cooked dishes.