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EcologyC. fusus, C. furca and C. lineatum are the Ceratium species that have formed blooms in the North Sea or adjacent waters. A relatively small concentration of 5 105 cells/l can have a major impact because of the size of the cells (up to 250 µm). A relationship between the size of the Ceratium stock and salinity was determined. As salinity decreased, Ceratium numbers increased.