Precious corals are slow-growing species so that it will be nearly impossible to raise and increase them artificially. Therefore, we created an environment in nature favorable for larvae settlement to see whether they could be raised. Tiles made of vinyl chloride and of various ceramics were set in an area where precious corals live for more than 1 year (Fig. 1). Unfortunately, no larvae settlement of precious corals was confirmed but many Hydrozoan corals were found on vinyl chloride tiles (Fig. 2). Since there were no Hydrozoan corals living in the area, confirmed settlement will be stimulated by the artificial plates. Now the types of plates attractive to precious coral larvae and the method of plate installation should be developed and then precious coral resources could be expected to increase in the natural environment.（Nozomu Iwasaki of Rissho University）