The phytoplankton diversity was very low in the Skagerrak and the Kattegat and cryptomonads were the most numerous. The integrated (0-20m) chlorophyll a concentrations were within normal in the Skagerrak and slightly below normal in the Kattegat. In the Southern Baltic a declining diatom bloom was observed with Skeletonema marinoi dominating. In the remaining areas small species like cryptomonads, colony forming cyanobacteria and unidentified dinoflagellates dominated. The integrated (0-20m) chlorophyll a concentrations were above normal at BY2, below normal at BY10 and BY15 and within normal at all other Baltic stations.