green cladophora algae, coquina stone rockpool, littoral zone underwater snorkel, oxygen rich low salinity saltwater

cladophora albida ulva rigida enteromorpha weed aquatic biological black sea bottom coast shallow depth diving ecology environment flora grow landscape marine nature pattern rock salt ocean seascape seaweed submerged sunny travel odesa wildlife swim exploration space shell gravel torn muddy sand mollusc vegetation wave surface macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication reflection green algae coquina stone rockpool littoral zone underwater snorkel rich low salinity saltwater biotope aquascape murky water sun