diadumene lineata sea anemone, invasive alien sea predator macro, mytilaster mollusc, polyp move tentacle in water flow

actinia sp sea anemone green striped flower transparent carnivore poisonous plankton dangerous feeding food predator venomous toxic invertebrate body atlantic ocean nature clear mytilaster lineatus 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