diadumene lineata sea anemone, polyp move tentacle to catch plankton in water flow, invasive alien sea predator macro

actinia sp green sea anemone striped flower transparent carnivore poisonous plankton dangerous feeding food predator venomous toxic invertebrate body atlantic ocean nature clear brackish odesa bay instinct active aqua animal aquatic live fishkeeping underwater salinity estuary fish tank stone substrate native wild fauna widespread reef space background colorful environment exotic aquascape aquaculture concept design biodiversity