Definition
Type of Environment:
Brackishwater refers to a mixture of sea water and freshwater, the salinity of which varies with the tidal movements. It is characterized by fluctuations in salinity due to regular influxes of freshwater and seawater, such as in estuaries, coves, bays and fjords. Enclosed water bodies in which salinity is greater than freshwater but less than seawater are also regarded as brackish.
Freshwater refers to the type of water whose level of salinity is from negligible to zero. Examples are the reservoirs, rivers, lakes and canals.
Marine water/seawater/saltwater refers to coastal and offshore waters where salinity is high and is not subject to significant daily or seasonal variation.