Mapping for the winter pool of nutrients in the Kattegat was performed. The weather was dominated by moderate winds from south to southwest. The sea surface temperatures as well as the surface nutrient concentrations were normal for the season. The spring-bloom had not yet started in any area. The bottom water at station BY4 in the Bornholm Bassin was oxygenated; concentrations over 4 ml/l was measured. Oxygen concentrations lesser than 2 ml/l were found below 70m in almost the rest of the Baltic Proper. Hydrogen sulphide was observed from 80m in the Bornholm Deep (BY5), from 125m at BY10 and from 150 m depth in the Gotland (BY15) and Fårö Deep (BY20).