chaetomorpha, ulva green algae oxygenate air bubble in laminar flow, black sea in odesa, low salinity biotope

ulva rigida cladophora albida sericea intestinalis enteromorpha intestinales callithamnion ceramium saltwater brackish aquatic coast depth flora algology algosociety macrophyte selfpurification littoral marine nature richness rock salt seascape underwater seaweed shallow submerged benthos habitat summer sunlight swim diving snorkel exploration travel wildlife environment pelagic ecology eutrophication photosynthesis sand sandbed ecosystem aquascape ukraine aquadesign chaetomorpha green algae oxygenate air bubble laminar flow black sea odesa low salinity biotope coquina stone water surface reflection vegetation