Polyhaline is a salinity category term applied to brackish estuaries and other water bodies with a salinity of between 18 and 30 ppt (parts per thousand). It is the most dense saltwater type we{who|date=July 2014} have. ...
Term to characterize water with salinity of 18 to 30
polyhaline Pertaining to brackish water having a salinity between ten and seventeen parts per thousand or to sea water having a salinity greater than thirty-four parts per thousand.