ulva green algae on coquina stone make air bubble, torn algal mess, littoral zone underwater snorkel, oxygen rich clear water

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow bryopsis ceramium environment flora grow thicket landscape marine odesa pattern rock salt ocean seascape seaweed submerged sunny travel water wildlife swim exploration space shell gravel sand still mussel mollusc vegetation surface wave macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication