ulva green algae oxygenate on coquina stone, littoral zone underwater snorkel, oxygen rich clear water reflection, laminar flow

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow bryopsis ceramium air bubble environment flora grow thicket landscape marine odesa rock salt saltwater 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