Experiments performed with a chromogenic bacterium designated as Flavobacterium piscicida (sp. nov.) indicates that this organism in pure culture is capable of killing certain fishes under laboratory conditions. This organism was isolated from a fish kill in which no dinoflagellate
bloom was present. Similar bacteria have been isolated from Red Tide outbreaks attributed to Gymnodinium brevis and from G. brevis cultures at the Marine Laboratory and indicates the possibility that a bacterium may be associated with fish deaths under natural conditions. Further
investigation is warranted as to the possible relationship of bacteria and dinoflagellates in causing the phenomenon known as “Red Tide.”
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