a seal is an aquatic mammal that lives in water. However, most seals can only live in the sea, not in fresh water. Seals are found in many parts of the world. Some live in the warmer waters of the tropics and temperate zones, and some live in the colder parts of the frigid zone. There are many kinds of seals and their habits are different, so they live in different sea areas. Although their specific distribution is different, they are all marine in general, so they can only live in the ocean and can not adapt to freshwater.
However, there is an exception to the seal, it is called "Baikal seal.". It is the only known freshwater seal in the world that can live in fresh water. Specifically, the distribution area of this seal is the Lake Baikal Basin in Russia, and their name is also named according to the area where they are distributed. They have a very long history of existence and have been living in the Lake Baikal Basin.
Seals can not be kept in fresh water. Because most seals can only live in the ocean and can not adapt to freshwater environment. Therefore, when they are cultured artificially, they also need to simulate the seawater environment, such as adding salt to the water and other measures. Only in this way can seals live normally and not die because they can not adapt to the environment. The only exception is the Baikal seal, which can live in fresh water, but most of them live in the Lake Baikal Basin, and there is basically no artificial breeding.