Does tuna fish come from dolphins?

Tuna and dolphins are completely different species of animals.

* Tuna are fish, belonging to the family Scombridae. They have gills and fins, and live entirely underwater.

* Dolphins are mammals, belonging to the family Delphinidae. They breathe air through lungs, have flippers and a blowhole, and give birth to live young.

While both tuna and dolphins are marine animals, they are quite distinct from one another.