Storing canned tuna in the refrigerator instead of at room temperature can help prolong its shelf life, but it may not necessarily remain good for months past the expiration date. The expiration date on canned tuna is usually provided by the manufacturer based on the product's expected quality and safety for consumption.
Refrigeration can slow down the deterioration process and bacterial growth, which can extend the freshness and edibility of canned tuna. However, it won't stop the degradation entirely. Over time, even under refrigeration, the quality of the tuna may decline, and it may lose its flavor, texture, and nutritional value.
For canned tuna, it's generally recommended to consume it before the expiration date for the best taste and quality. If you notice any signs of spoilage, such as a foul odor, off-flavor, or unusual appearance, discard the tuna even if it is before the expiration date.
If you have canned tuna that is nearing its expiration date and you don't plan to use it soon, you can consider freezing it. Freezing can further extend the shelf life, but it's essential to transfer the tuna to a freezer-safe container or resealable plastic bag to prevent freezer burn. When thawed, the texture may be a bit different from fresh tuna, so it's best used in dishes like casseroles, salads, or sandwiches rather than consuming it directly.
Always use your best judgment and follow proper food safety guidelines to ensure the food you consume is safe and enjoyable. If you have any doubts about the safety or quality of the canned tuna, it's better to err on the side of caution and dispose of it.