ulva green algae air bubble in low salinity black sea biotope, coquina stone littoral zone underwater, oxygen rich clear water

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow bryopsis ceramium landscape environment flora grow thicket 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 ecology ukraine