Abstract
The sporelings of red alga Porphyra tenera KJELLMAN var. tamatsuensis MIURA were cultured in media of various salinities at 16-17°C, under 9, 000 lux of fluorescent light for 10 hours daily. Culture media used for the experiment were prepared by dilution of sea water with distilled water, and by concentration with heating at lower than 70°C. These solutions iwere then enriched with KNO3 72 mg/l, KHO2PO44.5 mg/l Fe (as Fe-EDTA) 0.5 mg/l (=SWII), and PROVASOLI's PII metals 10 ml/l respectively. 1) The sporelings are sensitive to low salinity, and most of them grew into ab-normal frond shapes in salinities lower than CI 14.0%. 2) The optimal salinity for growth of sporelings is CI 17.0-18.0%. 3) High salinity also inhibits the normal growth of sporelings. Abnormaly shaped fronds appeared at CI 22.0%. 4) The liberation of monospores was abundant in the range of Cl 14.0-18.0%, and decreased with the lowering of salinity. 5) The most typical shape of abnormality of sporelings, which appear at low salinity of sea water, was the swelling of cell wall.
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