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Abstraa : Preliminary investigations on the extraction of phycocolloids from five common red algae of Sri Lanka revealed that Gracilaria edulis forms a suitable source for the production of agar. This coupled with the relative abundance of this species prompted the investigations on the cultivation of this alga and on the methods of extraction of agar from this species. Vegetative fragments from the apex of the plant were used as "seed" material for planting. Planting of alga was camed out from October 1982 to June 1983 and each month an experiment was set up using algae collected in that month. The algae grew t o its maximum size in about 2% to 3 months attaining a length of 30 35 crn and fresh and dry weights of 20 30 g and 1.5 to 2.5 g respectively. The agar content and gel strength of agar obtained from cultured G . edulis were determined. The amount of agar increased with increzse in growth of alga but there were no significant differences in the gel strength of agar. These data compare well with those obtained for naturally occumng G. edulis. The ' effects of different pre-treatments of naturally occumng G. edulis on the yield and gel strength, have been studied. While prior wet grinding increased both yield and gel strength of agar, prior soaking did not have any improvement on the agar. Extraction under pressure resulted in a product with increased yield and gel strength. Prior alkali treatment of the sea weed was found to increase the gel strength and pretreatment with KC! upto a concentration of 4% increased the gel strength markedly.

Studies on the agarophyte, <em>Gracilaria edulis</em>-experimental field cultivation and methods of improving yield and quality of agar