Most of us have eaten a tuna fish sandwich. Tuna is a healthy food. It is low in fat. It is a good source of protein, which helps build strong muscles. Tuna is also good for your brain. Eating fish like tuna helps to keep your brain at its best. Some people call tuna "brain food"!

Tuna is a kind of fish that lives in saltwater. Some tuna are small. Other kinds of tuna are very large. Some tuna can grow as large as 1500 pounds! Tuna live in oceans all over the world. They live in very warm water in tropical locations. Tuna also live in cold water in the northern seas. These kinds of tuna can raise their body temperature to stay warm in the cold water.

Tuna have only .....

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