ulva green algae in low salinity black sea biotope, coquina stone landscape, littoral zone underwater snorkel, oxygen rich water

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 aquascape mussel mollusc vegetation surface wave macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication