Polyhaline
Encyclopedia
Polyhaline is a salinity category term applied to brackish estuaries and other water bodies with a salinity
Salinity
Salinity is the saltiness or dissolved salt content of a body of water. It is a general term used to describe the levels of different salts such as sodium chloride, magnesium and calcium sulfates, and bicarbonates...

 of between 18 and 30 ppt (parts per thousand). It is the most dense saltwater type we have.
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