Abstract
To find the reason for outbreak of red tide, physiological characteristics of causative planktons have been studied. Present paper deals with Heterosigma inlandica n. sp. which caused red tide in Gokasho bay, Shima peninsula, 1966. Heterosigma inlandica was obtained in axenic culture by micropipette washings. The organism is wide range euryhaline. The optimal pH range was 8.5 to 9.0, the growth decreased with changing of pH. In the axenic culture, H. inlandica needs vitamin B12 for growth. The addition of other vitamins does not increase growth further. The pattern of specificity is similar to that of Ochromonas malhamensis. All the analogues containing henzimidazole can replace B12•H. inlandica prefers NO3 as nitrogen source. Urea and NH4 in low concentration, glutamine are good N sources. Uric acid, asparagine and arginine are also utilized but growth is less abundant. Inorganic and organic phosphates are utilized. Three purines (xanthine, hypoxanthine and guanine), and three pyrimidines (uracil, cytosine and thymine) increase growth in the presence of vitamin B12. From these results, the primary cause of the great increase of H. inlandica was discussed.
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