Sardines belong to a kind of fish, and they are relatively common fish. From the aspect of living environment, fish can be divided. For example, if they live in the ocean, they can be divided into marine fish; If they live in rivers, they can be divided into river fish. Among them, because rivers belong to freshwater, so river fish also belong to freshwater fish.
In this respect, sardines are marine fish, not river fish, because they are mainly distributed in the ocean. Because of the high temperature requirement of sardines, they need to be distributed in warm sea water, so they are more common in low latitudes and less in high latitudes. Specifically, sardines will have different species, different species of specific distribution of the sea area is different, but generally in low latitudes near the equator. Among the many species, some sardines live in the Pacific Ocean, more distributed in the West Coast; While others are found along the coasts of Europe and Africa. Therefore, sardines are widely distributed in the world.
The above has been introduced, sardines belong to sea fish, not river fish. Sardines can only live in seawater, and they have adapted to the seawater environment in the long process of evolution. The difference between the environment of sea water and river water is very large, if the sardines that have adapted to the environment of sea water live in the river water, they are very likely to be inadaptable, which may lead to their life span shortened, or even die in a very short time.
