Catfish is a relatively common fish. Compared with other species of fish, their appearance has some outstanding characteristics. For example, from the appearance of their body seems to have no scales, the surface is a lot of mucus; They have a very flat head, a large mouth, and four whiskers on their upper and lower jaws; They are black on the back and white on the belly.
The distribution range of catfish is very wide, and it is distributed all over the world. There are not only wild species, but also many artificially bred species. Because of their high food value and nutritional value, the behavior of raising catfish in captivity is relatively common recently, and many of them are raised in large areas. There are different species of catfish, and their specific distribution waters are different. Most catfish live in rivers, lakes, ponds and other places, that is, they live in fresh water; Other species are sea catfish, which live in the sea water.
As mentioned above, most catfish live in fresh water and are widely distributed in rivers, lakes, and other places. They have adapted to freshwater environments, where salinity is relatively low. The seawater environment is quite different from the freshwater environment, and the salt content is very different. If such catfish are suddenly put into the sea, they will not be able to adapt because of the high salinity, and may even die. However, some catfish are specialized in living in the sea, so this kind of catfish can be raised in the sea, but the catfish living in the sea is relatively small.
