Tuna is a kind of common fish. Their bodies are long and streamlined, with the thickest head and thinner closer to the tail. Its tail fin looks like a fork, and some are shaped like a crescent moon; They have a row of smaller fins on their backs. Tuna is a very fast swimming fish, sometimes reaching speeds of up to 160 kilometers per hour. Tunas belong to the class Osteichthyes, which means they're a group of bony fish. There are many kinds of bony fish, all of which belong to vertebrates. As a bony fish, tuna is also a relatively old fish. In terms of specific classification, tuna belongs to the tuna family, tuna genus.
As mentioned above, tuna is a kind of bony fish in terms of category. In addition, they can also be classified by their distribution waters. Marine fish are distributed in the sea, while freshwater fish are distributed in the fresh water. Tuna are mainly distributed in the sea area, so they belong to marine fish. Tuna are distributed all over the world, and the distribution is very wide. They are mainly distributed in the Pacific Ocean, Atlantic Ocean and Indian Ocean. They like to live in places where the water temperature is relatively high, preferably above 20 degrees, so they are more distributed in the lower latitudes of the three oceans, that is, tropical and subtropical areas.
