The marine world is still a great unknown to humans. We talk about different types of fish species or mammals and we can even be experts when it comes to feeding or talking about fishing. But do we really know the inhabitants of our seas? One of the most abundant fish in the ocean is tuna. There are almost a dozen species that are considered tuna. Its scientific name is Thunnus and in its first days of life they receive another name, that of cordilas. They can swim up to 11 kilometers per hour on short trips and are pelagic animals, that is, they live in the open sea. They travel long distances in their migrations to spawn, being able to advance up to 50 kilometers a day. Your flesh is red because your body contains a fairly high amount of hemoglobin. They can vary from 400 to 900 kilos and reach a length of up to 8 meters. We present you five different types of tuna.