The angelfish is a freshwater fish. Freshwater fish refers to the fish that can live in the waters with salinity of 3 ‰ or below for a long time or in a certain period of time, and their traces can generally be found in the wild freshwater basin. Angelfish is native to the Amazon River Basin in South America and belongs to the freshwater basin. Moreover, the water salinity value that angelfish can adapt to is between 0.5 ‰ and 1 ‰, and below 3 ‰. Therefore, the angelfish is a freshwater fish. They can't grow properly in higher salinity water.
Angelfish can not use sea water to raise. Angelfish belongs to a kind of freshwater fish, which can not be kept in the sea. The salt content in seawater is relatively high, and the density is also high, and the pressure is relatively high. Freshwater fish generally live in freshwater basins, where the pressure of water is relatively low. If it is put into the sea water rashly, there will be a phenomenon of osmotic pressure mismatch, excessive water in the body will be discharged with urine, resulting in dehydration, which is very easy to cause the death of freshwater fish. At the same time, the oxygen content between seawater and freshwater is also different, and it is difficult for angelfish to adapt to seawater. Therefore, in the process of breeding, do not easily put angelfish into the sea to raise.
