Calloplesiops altivelis
Spot the Comet fish in the Visayas, Red Sea or Okinawa. A rare reef find in warm 25-29 °C waters, here's how to identify it and where divers log it most.
A dark chocolate-brown body covered from nose to tail in small, even white spots immediately sets this fish apart on any reef. The fins are enormous relative to body size, the dorsal, anal, and caudal fins are all long and softly rounded, giving it an almost circular silhouette when fully spread. Look for a bold false eye-spot (a large white-ringed black spot) at the base of the dorsal fin near the tail, which mimics the eye of a moray eel and is the single most reliable in-water field mark. It rarely ventures far from cover, so you will usually see just the spotted fins trailing from a crevice.
Comets are cryptic (concealment-oriented) by nature, they spend most of their time tucked into reef crevices, caves, and under ledges, usually emerging only at dusk and into the night to hunt small invertebrates. When a diver approaches, the fish typically retreats tail-first into a hole, deliberately presenting the false eye-spot to mimic the head of a moray; it rarely bolts in open water. Patience and a torch during late-afternoon dives give you the best chance of seeing more than just the tips of its spotted fins.
That prominent fake eye-spot near the tail is a textbook example of automimicry: the fish presents its least vital end as a threatening "face", buying time to slip into cover while a predator hesitates.
No strong seasonal pattern emerges from the sighting data, so it can be treated as a year-round resident wherever it lives. Its observed temperature range of roughly 25 to 29 °C fits permanently warm tropical reef systems, which stay within that window throughout the year.
Most sightings come from the Philippines, particularly the Visayas, both the Central and East & North Visayas regions dominate the global record by a wide margin. Strong additional records come from the Okinawa Islands in Japan, the Egyptian Red Sea around Safaga and Marsa Alam, and the North Coast of Timor-Leste. Nha Trang in Vietnam and Nusa Tenggara in Indonesia also feature on the map, rounding out an Indo-Pacific spread.
Mapping where Comet is logged…
The Philippines is the standout location, especially the Central and East & North Visayas. Japan's Okinawa Islands, Egypt's Red Sea (Safaga and Marsa Alam), Timor-Leste's North Coast, and Nha Trang in Vietnam are also solid bets across the broader Indo-Pacific.
There is no clear peak season in the sighting data, so any time of year is a reasonable bet. The fish lives in permanently warm tropical waters between about 25 and 29 °C, which most of its core range maintains all year round.
Look for a dark brown, heavily white-spotted fish with very large, rounded fins. The definitive mark is a large white-ringed black spot near the base of the dorsal fin at the tail, a false eye designed to resemble a moray eel's head. You will often only see the spotted fins protruding from a crevice.
Comets typically reach around 16 to 20 cm in length. In the water they can look larger because their broad, flowing fins significantly increase their apparent size relative to their actual body.
The prominent false eye-spot at the tail base mimics the head of a moray eel. When threatened, the fish retreats tail-first into a crevice, presenting this convincing "face" to would-be predators. It is a defence strategy known as automimicry and is one of the most striking examples in reef fishes.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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