Tuna is a kind of fish that mainly lives in the ocean and belongs to bony fish. Tuna itself contains many species. Globally, there are fifty or sixty species of tuna. The difference between different species of tuna is relatively large. For example, size is an important aspect, sometimes the size difference between the two kinds of tuna, for example, some species can weigh up to six or seven hundred kilograms, but some species only weigh about three kilograms. In addition to their size, there are also differences in their appearance. And then there's the number of them, and some of the tuna are common species, and there are a lot of them; Some tuna are less common.
As mentioned above, tuna itself contains 50 to 60 species, and there are obvious differences between different species. Some of them are common varieties with large quantity and wide distribution, while others are not common varieties with narrow distribution and small quantity. The following categories are common:
1. Yellowfin tuna: This species has a spindle-shaped body, a small head, and a long, thin tail. Their body color is blue and blue, and their flesh is pink. Their adult body length is between 1-3 meters, and those over 2 meters are relatively large individuals, weighing more than 100 kilograms.
2. Bluefin tuna: The color of this species is generally dark blue, and the color of the fins is relatively dark. They also belong to a large group of tuna, large individuals can reach more than 3 meters, weighing more than 700 kilograms.
3. Bigeye tuna: This species has a blue-green back, a silver-white belly and sides, and pink flesh. They are distributed at relatively deep depths, up to 200-300 meters deep.
4. Albacore tuna: This species is a relatively small tuna, weighing about 15 kg, and the larger ones can reach 45 kg. Their distribution depth is generally not more than 200 meters below the surface.
