To provide a seaweed reef facilitating the growth of seaweeds and a lobster or a shrimp reef aiming at the protection and raising of the lobsters or shrimps by using the seaweed reef and the lobster or shrimp reef in combination.

Slender iron poles are stood from a bed of concrete blocks and each base with the seeds and seedlings sticking thereto is raised and fixed in the upper part of the iron poles to create a raised floor type seaweed bed. Thereby, injury of eating by sea urchins or shellfishes can be prevented. Since the floor is raised, there is a tidal current below the base and floating mud scarcely sticks. Since there is the tidal current, the growth of the seaweed is improved by overcoming difficulties of severe summer. The rooting of seaweed is improved to withstand even waves of typhoons, and the like, and increase the survival ratio and the seaweed bed creation is efficiently constructed by forming the base for establishing and fixing the seeds and seedlings of a rigid substrate such as a thick rope, a synthetic resin, a polyvinyl chloride pipe or a plastic.