You Are At: AllSands Home > Science > Animals > The tuna fish
What do they look like?
Tunas are some of the most well-known and popular fish both from a commercial standpoint and a scientific one. These fish are longer than they are wide. They have a very "aerodynamic" look. They resemble airplanes. Their "beaks" are small and rounded on the front. Their skin is very smooth and their bodies curve upward ever so slightly with small fins on top of their bodies. They have several other fins that resemble the wings of a plane. The fins on the back ends of their bodies are vertical. Tunas typically range in color from dark grays to blacks to silvers. A normal tuna weighs 10 to 20 pounds, although the largest tuna caught on record was 42 pounds.

How do they behave?
Tunas are fast. The shapes of their bodies enable them to reach these high speeds. They have the distinguished ability to hide their fins when they want to travel quickly. Little grooves along their bodies give them spots to tuck their fins away, when they need to. These fish sometimes need to travel great distances in nature, so this ability to swim quickly comes in handy. Tunas tend to migrate in bodies of water that are nowhere near each other.

What else should you know about tuna?
Tunas like to travel in schools. And these schools are generally fairly large, as in numbering in the hundreds. Schools of tuna like to try catching birds, believe it or not. You might naturally find a school of tunas under a large flock of birds.