close up of underwater coral reef stone - abstract texture - marine life

abstract andaman anthozoa aqua aquaculture aquatic aqueous atural biology building calcium carbonate close cnidaria colonies colony coral corals ecology ecosystem exoskeleton farming fauna habitat hard hermatypic india invertebrate island islands life marine nature nicobar ocean oceanic oceanography oceanology polyps poster rainforest reef reefs sea skeleton sponge stone stones stony texture tourism travel tropical under underwater water