Cephalopod Buoyancy Control: Pharaoh Cuttlefish Hovers Using Rippling Fin - 4K 影片檔

A pharaoh cuttlefish (Sepia pharaonis) hovers above coral rubble using the undulating fin running along each side of its mantle, often called a skirt, rippling in a wave motion to hold position with minimal effort. This fine hovering control is combined with buoyancy regulation from its internal cuttlebone, letting the cephalopod stay motionless over sand or coral without active swimming. A reef fish shelters behind it. 4K, wide angle, horizontal medium shot, side view, scuba diver POV. Phi Phi Islands, Andaman Sea, Krabi Province, Thailand.