The surface water temperatures were normal for the whole area. The nutrient concentrations were low in all sea areas with exception of HS 5 at the Jutland coast (high nitrate) and W Landskrona in the Sound (high silicate). These low values are normal for the season due to the algal blooms. Oxygen concentrations below 2 ml/l were found at depths greater than 80 m in the whole Baltic (from 70 m at Christiansö and in the Hanö Bight). Hydrogen sulphide was found at 80 m at Christiansö, from 75 m in the Hanö Bight and from 140-150 m in the eastern Gotland Basin. During this expedition hydrogen sulphide was also found in the northeastern Baltic at station BY 29, 175 meters.