"Saltwater" means water where the salinity is appreciable. This may be water where the salinity is constantly high (e.g. seawater) or where the salinity is appreciable but not at a constantly high level (e.g. brackish water): the salinity may be subject to periodic variation due to the influx of fresh or seawaters.
European Union, Regulation (EC) No 762/2008 of the European Parliament and of the Council of 9 July 2008 on the submission by Member States of statistics on aquaculture and repealing Council Regulation (EC) No 788/96