Abstract
Gyrodinium aureolum, a common “red tide” dinoflagellate in European waters often associated with fish mortality, was isolated from the Oslofjord, Norway, and analysed for chlorophylls and carotenoids. Besides chlorophyll a and c the following carotenoids were characterized by thin-layer chromatography, visible light spectrophotometry and mass spectrometry: β,ε-carotene, ß,ß-carotene, djatoxanthin, diadinoxanthin, 19′-hexanoyloxyfucoxanthin and 3 xanthophylls which could not be correlated with hitherto structurally known carotenoids from dinoflagellates. G. aureolum deviates from most dinoflagellates by the lack of peridinin, but shows affinity with Gyrodinium sp.-A by the possession of 19′-hexanoyloxyfucoxanthin.

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