The surface temperatures were between 14.3 and 17.7°C. Nutrient concentrations were normal for the season in all areas. In the Skagerrak the surface salinity was <30 psu at the coastal stations and >32 at the western stations of the Å transect . In the Kattegatt the surface salinity ranged between 20 and 21 psu. Oxygen concentrations below 2 ml/l were found below 30 m depth in the western part of the Arkona Basin and from 70 m in the Bornholm Basin and the Hanö Bight and generally at depths exceeding 80 - 90 metres in the other parts of the Baltic Proper. Hydrogen sulphide was found near the bottom at the Bornholm Depth and from 125 meter in the Eastern Gotland Basin and at depths below 150 meter at the Norrköping Depth.