Both fresh water and salt water occur in nature, so both are natural. Note, however, that fish that live in fresh water generally cannot survive in salt water and fish that live in salt water generally cannot survive in fresh water.
In quiet waters that don't mix very much, such as the Baltic Sea, fresh water from rivers tends to stay on top, floating on the salt water from the ocean. This is caused by the difference in their densities.
Fishermen can catch fresh water fish near the top and salt water fish from lower down.
Where salt water and fresh water meet and mix you have 'brackish' water, which is halfway between salt and fresh, more or less. This is what usually happens in estuaries where a river meets the sea.
to have a tast
salinity
saltwater has salt in it, freshwater does not.
Salt in the water. Salt water.
All ground water is freshwater. But not all freshwater is in the form of groundwater. E.g. freshwater may exist in the form of ponds, lakes, rivers or ice caps.
Salt in the water. Salt water.
Maybe that saltwater animal can endure hard water and freshwater animals can't.
freshwater lake has no salt and saltwater has many salt particles
umm the salt water is used to ahving salt in its natural habitat and the fresh water is not
a salt water lake has a freshwater inlet but and inland sea has no inlet.
Goldfish are freshwater pond fish, fish in the sea live in salt water.
There is no osmotic difference. This happens more with freshwater vertebrates than marine creatures.
The difference is all fish stay alive in different types of water warm,cold,fresh, salty. They do different things in different water