Although puffer fish has the word "river" in its name, they are not fish living in river water. They are widely distributed and have strong adaptability. Most puffer fish grow in seawater, and most of them are distributed in tropical, subtropical and temperate waters. There are also some dolphins that live at the mouth of rivers, like most puffer fish in China live at the mouth of the Yangtze River.

Therefore, puffer fish can not be called freshwater fish and marine fish in general, but should be judged according to their distribution range. Puffer fish have the characteristics of migration. For example, dolphins distributed at the mouth of the Yangtze River will swim between river water and sea water to lay eggs in a specific season, and they will swim back to sea water or river water after breeding.

As mentioned above, some species can live in fresh water. However, there are not many puffer fish varieties that can live in fresh water. If you want to breed puffer fish, it is best to select some puffer fish that are suitable for living in fresh water, so as to better conform to their native environment. In addition, there are some puffer fish at the junction of sea water and river water, which may be produced in fresh water during mating season. After laying eggs, swim back to the original sea water. Therefore, this puffer fish can also grow in fresh water, but if conditions permit, it is better to use seawater culture, which can make them adapt faster.