The body of a tuna is also spindly, narrow and pointed on the tail and head. The skin is steel-blue with green and  lavander reflections.

It has two fins on its chest and two on lower belly (toward the tail). On its sides, behind the gill cavities it also has side fins as well as a large fin on the back. The tail is big with equally long flippers with an indentation in the middle. There are also a few crooked fins  from the back fin towards the tail. Tuna is the only warm-blooded fish in the entire animal kingdom.

It may reach the weight up to 600-630 kg, and may grow over four meters long. Tuna lives in the Atlantic sea, but can be found in many other seas around the world. In the Adriatic sea, tuna can be found at all depths.

Tuna is a great swimmer

Tuna is a great swimmer and a skilled predator who lives in a houl with its coevals. Its strong and spindly body and an extremely strong tail gives it a chance for fast and long movement in catching its prey. Tuna is one of the fastest fish in the sea.  Its average moving speed is 12.5 km/h, but it can gather speed up to 100 km/h. It also doesn't need a lot of time to rest. They have a great metabolism which can hold their temperature even 20 degrees higher than the sea temperature.

To keep their body warm, they must always be in motion, so a tuna, in its 15 years of life, swims over
1.0.0    miles.

Tuna are predators and feast mainly on mackerels, harrings, squids and crabs, who are an easy target because of its speed.