The diversity was high and diatoms dominated the phytoplankton community in the Kattegat and the Skagerrak. A flagellated cell that most likely is Vicicitus globosus or a naked stage of Dictyocha speculum or D. fibula, was common in this area.
The species diversity and cell density was generally low in the Baltic Sea. Species from the diatom genus Coscinodiscus were common or present in all regions of the Baltic Sea.
The integrated (0-10 m) chlorophyll a concentrations were normal for this month in the Skagerrak, the Kattegat and the Baltic Sea.