River fish and marine fish are classified according to the living environment of living fish. Carp is a kind of freshwater fish, living in rivers, lakes and other freshwater waters. Therefore, carp belong to river fish, not marine fish, because they can not live in the ocean, can not adapt to the environment in the sea.
Specifically, carp are widely distributed in rivers everywhere. Carp is native to Asia and lives in many Asian countries, such as China, Japan and so on. Carp is basically distributed in rivers all over our country, both in the south and in the north, because their adaptability is very good. Later, they were introduced to other continents, and are now distributed in rivers in Europe, North America and other continents.
As mentioned above, carp is a kind of freshwater fish living in rivers, and it can be said that it is widely distributed in rivers all over the world. Carp can not survive in the sea, because they live in fresh water in the long process of survival, their body structure and various functions have been fully adapted to the freshwater environment, and the difference between sea water and fresh water is very large, if carp to the ocean, it will lead to their inability to adapt to the situation. For example, the salt content in seawater is very high, and the physiological regulation mechanism of carp can not adapt, which may lead to their life span shortening or even direct death.
