Studies on the Cultivation of an Edible Brown Alga, Cladosiphon okamuranus-I

Since 1972, the writers have been studying the ecological characters of Ciadosiphor okamuranus found in Amami-oshima Island, in relation to its cultivation.1) The present plants were found chiefly on skeletons of dead Madreporaria and seaweeds, sometimes on pebbles, cans, shells of dead shellfishes and others.2) The germlings of this plant were fround on polyethylene films as a substratum all the year round.3) During October to June, these plants attained 20cm or more in height, but in July to August, its maximum height was only 2cm.4) The optimum period for seeding of zoospores was found between the 20th to the 25th day of the moon's phase, and the optimum depth for seeding was observed to be at a depth of 2 meters.5) The plants produced unilocular sporangia during late March to June. Pluriloculax sporaniga were found at all seasons.