Sammanfattning
A winter situation with small amounts of phytoplankton is at hand. In the Skagerrak and Kattegat Ceratians and Thalassiosira punctigera are the most common species. In the Baltic Chaetoceros impressus and C. danicus together with Dinophysis acuminata, D.norvegica and Aphanizomenon sp., all in very small amounts, dominate.