When it comes to canned tuna, there are two primary types: white and light. Both are made from the same fish, but white canned tuna is typically lower in mercury than light canned tuna. This is because light canned tuna is made from a smaller variety of fish that tend to be higher up on the food chain (and therefore accumulate more mercury).
Canned tuner means that the fish has been cooked and packaged in a can. This type of packaging helps to preserve the quality of the fish, as well as extend its shelf life. Canned tuna is a convenient option for those who want to enjoy the health benefits of seafood without having to cook it fresh.