Initially, mooring buoys were provided only for long-tail boats; the main vessel used for conducting snorkelling activities. However, these buoys were unable to support large SCUBA vessels and resulted in damage to the buoy and reef beneath. In addition, since no buoys were provided specifically for SCUBA diving, crowding occurred along with conflicts of use between snorkelling and SCUBA diving groups. After the installation of buoys in 2002, designated activity areas were clarified and crowding reduced. In addition, the percent cover of branching, foliose and tabulate corals, which are more sensitive to damage by diving and related activities, increased (Table 3).