Judging whether the Thai betta is a freshwater fish depends on the environment in which they grow. Freshwater fish usually live in rivers, lakes and other freshwater waters, the salinity of these waters are less than 0.05%. Wild Thai fighting fish grow in lakes, paddy fields and other slow-flowing waters in tropical areas, where the salinity of the waters meets the standards of freshwater. In addition, they can not survive in salt water with salt content greater than 0.05 G/L, and can only live normally in fresh water. Therefore, according to the environment in which the fish live, the Thai fighting fish belongs to the typical freshwater fish.
As mentioned above, Thailand fighting fish is freshwater fish. Generally speaking, freshwater fish can tolerate water with a salinity of less than 0.05%. The average salinity of the sea has reached 3.5%, 70 times the tolerance limit of freshwater fish. Therefore, as a freshwater fish, the Thai fighting fish can not be raised in seawater. If they are forced to breed in seawater, because the salinity of the fish is lower than that of the seawater, the water in their cells will penetrate into the seawater, resulting in dehydration of the cells. And they can't rehydrate themselves by ingesting seawater. After a large number of cells are dehydrated, the fish will die. Therefore, it is recommended to use fresh water with salinity less than 0.05% to raise Thai paradise fish.
