Sunfish are freshwater fish because they all live in fresh water. The origin of sunfish is America, and sunfish are found in many lakes in the southern United States. There are also sunfish in fresh water such as rivers and lakes in northern Mexico. In addition to these areas, sunfish are found in Canada and other countries, but in a smaller number.

Sunfish has been introduced into many countries for its bright colors and tender meat. Sunfish have been introduced into China and distributed in southern China. Now there are artificially farmed sunfish, all of which are farmed in fresh water, so sunfish belongs to the standard freshwater fish.

Sunfish is a freshwater fish, and no matter what country or region it is distributed in, it lives in freshwater. Sunfish have adapted to the freshwater environment, and their body structure has evolved according to the freshwater environment, so sunfish cannot live in seawater. The salt content in seawater is high, which is quite different from that in fresh water. Sunfish may suffer from discomfort and death. Moreover, the pressure of seawater and fresh water is different. If sunfish grow in seawater, they may not be able to adapt to the pressure of seawater.