The Ganges River is freshwater.
Gold fish are fresh water fish and will die in saltwater, but jelly fish are mainly saltwater fish. Yet, there is one species of jellyfish that is in a freshwater lakes , Allegheny River, Ohio River, and the Tennessee River, but it is not a true jellyfish.
fresh water
Most are natural freshwater, but some may be saltwater.
delta
an estuary
Saltwater fish have a natural habitat in the sea. Whereas, freshwater fish has a habitat in a river or a lake.
saltwater freshwater saltwater freshwater
They contain saltwater and freshwater
they are both saltwater and freshwater
Ohio river
The Persian Gulf is saltwater, not freshwater.