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Biological and chemical studies have been conducted on some important species of Sargassum and Turbinaria to determine the optirnum periods for harvesting the algin-yielding seaweeds o£ the Mandapam area (UMAMAHESWARA RAO, 1969). The present paper reports the results obtained on growth, fruiting in relation to quantitative changes in mannitol and alginic acid contents of Turbinaria ornata (TURNER) J. AGARDH for a period of four years, from January 1967 to December 1970. Materials and Method Turbinaria ornata in the Palk Bay, near Mandapam, commonly grows on coral debris and coral stones at l -- 2 m depth. About 50--100 plants were collected from this area at monthly intervals. Total length of all the plants was measured in the laboratory and mean heights of the plants together with their Standard deviations were calculated. Chemical analysis of the dried plants was carried out as reported earlier (UMAMAHESWARA RAO, 1969)

Changes in Mannitol and Alginic Acid Contents of Turbinaria ornata (TURNER) J. AGARDH in Relation to Growth and Fruiting