Chattonella antiqua(HADA)ONOの潮流による集積〔赤潮プランクトンの集積機構に関する研究-1-〕

概要

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The large scale of red tides of Chattonella antiqua often took place at the Harima Nada which locates in the eastern part of the Seto Inland Sea, in summer. The red tides occurred usually with the interval of about 2 weeks and brought the lethal effect to fish. In order to clarify the mechanisms on the accumulation of C. antiqua and the occurrence of red tide, the relations between the accumulation and its environmental factors such as the velocity and direction of tidal current and wind were examined during the floating time (10:00-16:00) of the plankton, by refering some related data in 1977 and 1978. As the results, it was suggested that C. antiqua accumulated at the south-west part of the Harima Nada at the period which a few of days had long time of flood, whereas the plankton accumulated at the off shore and center area of the Nada or disappeared from the Nada at the period which a few of days had long time of ebb. On the other hand, the relation between the accumulation and the velocity and direction of wind could not find so remarkably, the weak wind with north-east blowing usually at the south-west part of the Nada during the occurrence of red tide.
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