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SALTWATER
saltwater
Saltwater, hence Mediterranean Sea.
Freshwater and saltwater meet at the mouths of rivers that flow into the sea.
There are both saltwater and freshwater varieties.
Saltwater fish have a natural habitat in the sea. Whereas, freshwater fish has a habitat in a river or a lake.
The SOUTH CHINA SEA separates Vietnam from the Philippines.
It is now almost dried up. The remains are salty.
Guppies are freshwater fish: Sea horses are saltwater fish
The sea found south of China is the South Chinese sea or South China Sea.
South China Sea
I'm not sure what you mean by a freshwater salmon exactly, but the fish commonly called a sea trout is a type of perch and completely unrelated to salmon.