We study the ecology and physiology of seaweeds and seagrasses, which are very important primary producer in the coastal ecosystem. Our laboratory focuses on the roles and the functions of seaweed and seagrass communities in the coastal ecosystems, the restoration of seaweed beds from barren grounds (ground devoid of seaweed beds) and the development of aquaculture techniques of seaweeds. We conduct field surveys and laboratory culture experiments to elucidate the factors affecting the seaweeds growth and reproduction, such as water temperature, light intensity, wavelength of light, nutrients, and density of herbivores. We conduct research and education on the conservation of coastal environment with reference to seaweed and seagrass communities.