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Marine bacteria are one of the most influential organisms on the growth of microalgae in seawater and their effects are either stimulative1-4) or inhibitory.5,6) However, very little information is available on the bacterial behavior during the development or the decay7) of a phytoplankton blooming (red tide), although they should play a significant role during the algal blooms. Red tide can be considered to be an explosive growth of one or a few selective species of phytoplankton among the usual flora and as the succession of dominant species of plankton. It is therefore important to clarify the effect of bacteria on the development and the decline of red tide and on the succession of phytoplankton species predominating for the prediction and the prevention of red tide. Riquelme et al.8) reported that a specific Pseudomonad bacterium increased prior to the development of a bloom of a diatom Asterionella glacialis in Maizuru Bay and that this bacterium produced a glycoprotein as a growth factor for A. glacialis.9) They demonstrated the close relationship between the bacterium and the alga.8,10) However, the inhibitory effect of a bacterium on the decline of phytoplankton bloom has neither yet clarified nor elucidated the influence of the bacteria effective on one species of plankton on the growth of the other species. G. nagasakiense Takayama and Adachi (Dinophyceae)11) is one of the most noxious phytoplanktons causing mass mortalities of fish culture in a western region of Japan,12) although it is said up to now that it has no effective toxicity.13) We have frequently had heavy red tides consisting of G. nagasakiense in Uranouchi Inlet in Kochi and serious damage has often been caused from the end of June through July. Although many studies have been carried out on the physiology of the growth of G. nagasakiense14-17) and on many physico-chemical environmental factors such as temperature, light intensity, inorganic nutrient and others, the mechanism of the

Distribution of Bacteria Influential on the Development andthe Decay of Gymnodinium nagasakiense Red Tide and Their Effects on Algal Growth.