Is Mola a marine fish or a freshwater fish?

Sunfish is a kind of freshwater fish, which originated in the United States. They are mainly distributed in the lake system of the United States and fresh water areas such as rivers and lakes in Mexico. Later, it was introduced to other continents and countries, and there were also artificial breeds in China. However, they can only live in fresh water, not in seawater. So, they are freshwater fish, not sea fish.