saccostrea or hooded oyster or christmas rock oyster

abstract animal aqua aquatic attached background barnacles beach biodiversity bioindicator biology bivalve blur clam closeup coarse coast coastal craggy design ecology environment fresh gastropod glomerata hooded indian invasion kidneyshaped life limpets mangrove marine mediterranean mollusc mollusk natal natural nature ocean outdoor oval oyster oysters pacific pattern phytoplankton polluted pollution purplishbrown river rock rocky rough saccostrea sandstone sea seashore sharp shell shellfish shells shore species spiny sticking stone structure surface texture textured thailand tropical wallpaper water white wild zoology