Artificial reefs were.set on the bottoms at 5-10m depth along the coast of Tosa Bay, southem Japan. They are fixed the plastic curl mats of 4 and 12cm thick on the surface of the concrete brocks. There were much biomass of attached animals in the plastic curl mats. Their biomass have been increased with time and attained 105 species, 10,280 individuals/m2 and 298.13w.wg/m2 in the thin mat after 18 months. The dominant species in the mat was small crustacea. The biomass of attached animals in the thick mats showed higher values than that in the thin mats. The biomass of attached animals in the mat were also about 10 times of values compare with them on the concrete.
Southeast Asian countries have strong interest in the artificial reef project in their territorial zone. To aid their program, the author implemented the following items at the Gulf of Thailand. First, an evaluation survey had been carried out at the sites installed several types of meager modules for the last two decades by the Govemment of Thailand. Second, an experiment was implemented, using the new types of bamboo-reinforced concrete modules from the economical point of view, Which durability must be longer and inexpensive than steelreinforced concrete. Follow-up survey had been carried out for one year after installed the modules from the physical point of view; i.e. to verify the stability of the modules. As a result, fortunately, immediately after the ihstallation of the modules, they were proved to have stronger resistance to extemal forces than stated in the desing calculations. Nevertheless, the modules were found to be stable and undamaged during the follow-up survey. As a conclusion, bamboo-reinforced concrete is suitable and recommendable material for the artificial reef module in the region.