The phytoplankton diversity and cell concentrations were low in the Skagerrak area. Small diatoms dominated. In the Kattegat the potentially toxin producing genus Pseudo-nitzschia spp dominated the community. The potentially harmful naked dinoflagellate Karenia mikimotoi was present. The integrated (0-10 m) chlorophyll a concentrations were normal for this month at all stations except at the second visit at Anholt E where it was a bit higher than normal for the season. The diversity and cell concentrations were low at all stations The southern stations were dominated by relatively large diatoms, the eastern stations were dominated by small colony forming cyanobacteria and the western stations had a community with both of these groups represented in almost equal amounts. The integrated (0-10 m) chlorophyll a concentrations were normal for this month with an exception of the western stations where they were a bit above normal for this season.