Canned tuna sold in U.S. supermarkets requires no ... it moves onto the final canning where it is packed with liquid like a saltwater brine or oil, as well as any additional spices or seasonings ...

Canned tuna is cooked whole by baking, then tinned in either water, saltwater brine, or oil. Pre-cooking and preserving tuna are two types of processing that are routinely used and not detrimental ...