Summary
Some chains of Skeletonema marinoi and Guinardia delicatula was still present as a remembrance of the spring bloom in the Kattegat and Skagerrak area. Except for the diatoms, small flagellates of different sorts were most common. The integrated chlorophyll concentrations were above normal at the Skagerrak stations but normal for this month in the Kattegat. In the Baltic Sea, some remnants of the spring bloom were found as both Skeletonema marinoi and Peridiniella catenata were common at several stations. The dinoflagellate genus Dinophysis* was common and also the genus Dinobryon. The integrated chlorophyll concentrations (0–10 m and 0–20 m) were above normal for this month at all stations.