how long can you keep it in the fridge

Did you make it yourself or did you buy it at a store deli? I've gotten food poisoning from eating tuna salad from a deli on the same day I bought it. I suspect the deli made it using mayonnaise that had been sitting out.

Tuna salad I make myself will usually last two days in the refrigerator, but tastes more "off" the older it is. I've never gotten sick from it even at 3 days old, but it doesn't taste as fresh at 3 days.

i made it myself a week ago.

You definitely need to throw it out if it is a week old.

Ana

thank you very much.