is a kind of fish that can be eaten, and its value is relatively high. Salmon is often sold in the market. Fish belong to vertebrates, although they belong to vertebrates like humans and other mammals, but they are relatively low animals, there are many advanced structures that are not, such as lungs. However, fish and mammals also have some structures and organs in common, reflecting commonalities. For example, fish, like mammals, have blood, and the color of blood is generally red.
Salmon has blood. But the salmon usually sold in the market is usually salmon fillets, this kind of salmon is generally not handled, basically no fish bones, no blood, so people may mistakenly think that salmon is bloodless. In fact, salmon has blood, but compared with higher animals such as humans, the amount of blood in salmon is less. When buying salmon, they sometimes have some blood left on their bodies, which is their blood. However, be careful to distinguish between their blood and parasites, and sometimes they carry some parasites on their bodies.
? As mentioned above, salmon has blood, and blood flows in blood vessels, so salmon also has blood vessels. However, because their blood volume is relatively small, blood vessels also exist in their bodies and are not easy to observe, but it can not be considered that they have no blood vessels. Salmon's blood vessels are present all over the body, especially in the head. From the point of view of salmon's systemic vascular system, it is also more complex, although it can not be compared with human beings, but compared with lower animals, salmon has a relatively high vascular circulation system.
