black sea - underwater landscape, filamentous green algae haetomorpha linum on rocks near the shore

alga algae thickets algal flora algobiota algology algosociety aquatic black sea brown ceramium ecological ecology enteromorpha environment eutrophication filamentous grass green haetomorpha macrophytes marine nature odessa bay oxidation oxygen water synthesis photosynthesis plant polisiphonia riparian vegetation saltwater seaside seaweed selfpurification ulva undersea underwater footage landscape shot world wild wildlife linum rocks shore gulf