PURPOSE: An artificial waterweed grove is provided to prevent the phenomenon of chlorosis generated in the districts along the shore, and to facilitate the transportation and the installation thereof. CONSTITUTION: The artificial waterweed grove is comprised of several waterweeds formed by many pieces sectionalized by many longitudinal incision grooves, and a fastening device for fixing the artificial waterweed on the bottom of the sea. The fastening device comprises a lattice shaped base frame; a fastener for coupling the lattice shaped base frame with the artificial waterweed; and an anchor connected to the lattice shaped base frame. Alternately, the fastening device may be constituted by several floating bodies instead of the base frame.
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