If canned tuna is bad, it will have a sour smell, off-color, or moldy. \nIf the canned tuna smells sour, off-color, or moldy, it is bad and should be thrown out.
What Happens If You Eat Bad Canned Tuna?

If you eat bad canned tuna, you may experience symptoms such as nausea, vomiting, and diarrhea. You may also experience more serious symptoms such as kidney failure, if the canned tuna was contaminated with mercury.
What Color Is Bad Canned Tuna?
If the canned tuna is discolored or has an off odor, it is bad and should not be eaten.
If the canned tuna is discolored or has an off odor, it is bad and should not be eaten.
How Can You Tell If Canned Tuna Is Rotten?

If canned tuna is rotten, it will have a sour smell and will be discolored. The tuna will also be mushy and have a bad taste.
How Long Is Canned Tuna Good?
Canned tuna is typically good for 2-5 years.
Canned tuna typically has a “best by” date of 2-5 years.
What Does Bad Tuna Smell Like?

Bad tuna smells fishy, salty, and slightly sweet.
If tuna smells bad, it is probably not safe to eat.
How Can You Tell If Canned Food Is Bad?
If the can is bulging, rusted, or leaking, the food is bad. If the food smells bad, it is bad.
If the food looks bad, it is bad.
Is Grey Canned Tuna Bad?
There is no definitive answer to this question as opinions will vary. Some people believe that GREY canned tuna is fine to eat, while others believe that it is not as good as white canned tuna. Ultimately, it is up to the individual to decide whether or not they want to eat GREY canned tuna.
Can You Get Food Poisoning From Canned Tuna?
Yes, you can get food poisoning from canned tuna. Canned tuna can be contaminated with mercury, which can cause food poisoning.
Can You Get Botulism From Canned Tuna?
There is a very small risk of botulism from canned tuna. Botulism is caused by a toxin that is produced by a bacterium called Clostridium botulinum. This bacterium can grow in canned tuna if the fish is not cooked properly.
The risk of botulism from canned tuna is very low, but it is important to follow the cooking instructions on the can to make sure the fish is cooked properly.
Why Does Canned Tuna Last So Long?
Canned tuna lasts so long because it is canned.
The canning process involves heating the tuna to a high temperature which kills any bacteria that may be present. The can also seals in the tuna, preventing any new bacteria from getting in.
How Long Does An Open Tin Of Tuna Last?
An open tin of tuna will last for about 3-5 days in the fridge.
If you want it to last longer, you can keep it in the fridge for up to 2 weeks.