Artificial reefs are used throughout the\ud world to increase the fisheries poter\tial of barren\ud or relatively unproductive areas. Artificial reefs\ud also act as effective fish attracting devices during\ud certain times of the year. Reefs when properly\ud located and structured not only concentrate fishes,\ud but also increase the biological productivity of the\ud area. Formation of rough rigid bottom habitat\ud with artificial reefs of diverse materials increases\ud the surface area necessary for fish food organisms.\ud The reefs also often serve as spawning habitat and\ud shelter for fishes and shellfishes
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