Batfish
Scientific name Platax pinnatus
Batfish are graceful, disk-shaped reef fish known for their tall dorsal and anal fins and calm, curious behaviour around divers. As juveniles, they look completely different from adults — often dark brown or black with bright orange edging, mimicking drifting leaves for protection.
As they mature, they develop a silver-grey body with subtle vertical shading and grow into impressive, plate-like shapes that can reach up to 60 cm tall. Around Koh Tao, they are often seen cruising slowly along reef slopes or hovering beneath mooring lines and pinnacles.
Batfish are naturally inquisitive and sometimes approach divers, especially at popular sites. Their slow, deliberate swimming and reflective bodies make them stand out beautifully against the blue water.
They play an important ecological role by feeding on algae, small invertebrates and plankton, helping maintain reef balance. Juveniles often stay close to sheltered reef areas, while adults may form small schools in mid-water.
A close encounter with a curious batfish often becomes one of the most photogenic moments of a dive.
Find Batfish at...
Divemaster's tip
Look in mid-water near pinnacles and around mooring lines between 8–25 metres. Juveniles are often found closer to reef structures, while adults cruise more openly.
Move calmly and avoid chasing them — their curiosity may bring them closer to you if you remain still.
What do they eat?
Batfish are omnivores. They feed on algae, small crustaceans, jellyfish, plankton and organic debris.
Their flexible diet allows them to adapt well to different reef conditions, making them a common and reliable sighting around Koh Tao’s dive sites.
