ulva, cladophora lush green algae grow in low salinity black sea biotope, coquina stone littoral zone snorkel, oxygen rich water

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow bryopsis ceramium underwater landscape environment flora grow thicket marine odesa rock salt saltwater ocean seascape seaweed submerged summertime travel wildlife swim exploration space shell gravel sand aquascape mussel mollusc vegetation air bubble wave macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication ecology ukraine