Growth Potential of Gymnodinium mikimotoi in Gokasho Bay.

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  • 五ケ所湾におけるＧｙｍｎｏｄｉｎｉｕｍ　ｍｉｋｉｍｏｔｏｉの増殖ポテンシャル
  • ゴカショワン ニ オケル Gymnodinium mikimotoi ノ ゾウ

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Abstract

Algal growth potential (AGP) of Gymnodinium mikimotoi was examined at a sampling station situated in Gokasho Bay during a red tide period from 1991 to 1994. In the year 1991, 1992 and 1994 when the bloom of G. mikimotoi occurred, the high AGP of seawater at the depth of 1.0m above bottom (B-1m) was observed at the order of 103 cells/ml before the peak of the algae. But the AGP didnot increase during the period from June to August in 1993, the year of no development of G. mikimotoi. These results indicate the possibility of predicting red tide by AGP of seawater at the depth of B-1m.<br>The growth limiting nutrients in Gokasho Bay were also studied using AGP assay. The growth yield of G. mikimotoi was enhanced by the addition of phosphorus to filtered seawater prior to development of the algae. When the bloom of G. mikimotoi occurred, the lack of phosphorus was not found. Therefore, it was suggested that the nutrient factor which control development of G. mikimotoi red tide was phosphorus.

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