Chattonella and Fibrocapsa (Raphidophyceae):First Observation of, Potentially Harmful, Red Tide Organisms in Dutch Coastal Waters

Species of the potentially toxic and red-tide-forming marine-phytoplankton genera Chattonella and Fibrocapsa (Raphidophyceae) were observed for the first time in 1991 in samples taken in Dutch coastal waters; they were again recorded and enumerated in the following years. Chattonella spp. cell numbers varied with the season, with a maximum in May or June in the Dutch Wadden Sea. Cell numbers of Chattonella and F. japonica Toriumi et Takano were up to 6.0 . 10(3) cells . dm(-3) in the Dutch Wadden Sea, except at one station in June 1993 when over 10(4) cells . dm(-3) Chattonella were counted. I... Mehr ...