Summary
The total cell concentrations in the open Skagerrak and in the Kattegat were relatively high. The potentially toxic diatom genus Pseudo-nitzschia * dominated at all stations. The coccolithophorid Emiliania huxleyi was common among the small cells at all stations. The integrated chlorophyll concentrations in the surface water (0-10 m) were within normal for this month except for Fladen where the concentration was above normal. The integrated chlorophyll concentrations in the deeper water (0-20 m) were within normal for the month except at N14 Falkenberg where the concentration was above normal for the month. The total cell concentrations and biodiversity were low in the whole Baltic proper. The diatom genus Actinocyclus was present in moderate amounts at many stations. Some filaments of the cyanobacteria Aphanizomenon flosaquae were present at the sampling stations in the southern part. The integrated chlorophyll concentrations in the surface water (0-10 m) were within normal for this month except for the southern Baltic where the concentrations were below normal. The integrated chlorophyll concentrations in deeper water (0-20 m) were within normal for the month except at BY38 Karlsö deep where the concentration was slightly above normal for the month.