The cell concentration was very low at Å17 in the open Skagerrak. The chlorophyll fluorescence measurements and the high nutrient concentrations showed that the spring bloom had not yet started here. The diatom spring bloom was ongoing in the Kattegat and at Släggö on the Skagerrak coast. The diatom Skeletonema marinoi dominated the phytoplankton community in this area. The cell density was generally very low in the Baltic Sea during this visit.
The integrated (0-10 m) chlorophyll a concentrations were higher than normal at the coastal stations in Skagerrak and Kattegat. The values were normal for this month at the stations in the open water of Kattegat and Skagerrak and in the Baltic Sea.