Vertical profiles of salinty are collected on a monthly basis in the Gulf of Trieste – time series station using a CTD multiparametric probe. The site is part of the LTER-North Adriatic site. Data are used to characterize the temporal dynamic of hydrological properties in the coastal Long Term Ecosystem Research station of the Gulf of Trieste, in the northernmost part of the Adriatic Sea and of the Mediterranean basin. General information can be found at: http://nettuno.ogs.trieste.it/ilter/BIO/index.html