Lutjanus monostigma
Silvery reef snapper with one dark side-spot, logged widely in the Maldives' Central Atolls and Raja Ampat in 24-29C water year-round.
Look for a silvery to pale yellow-grey body around 40 cm long with a single dark blotch sitting just below the dorsal fin toward the tail, the feature that gives it its name. The body is deep and slightly compressed, with a blunt head and a steep forehead typical of snappers. It often hangs in loose groups just off the reef structure rather than tight in cover.
Usually seen hovering singly or in small, loose groups along reef walls and drop-offs rather than schooling tightly like some of its relatives. It tends to hold a steady position just off the coral rather than darting for cover, making it an easy, unhurried subject once you spot it. Most sightings are logged during daylight reef dives at moderate depth rather than deep or twilight hours.
Despite its solitary-looking daytime posture, it hunts small fish and invertebrates mainly after dark, so the calm hovering you see on a day dive is largely a resting phase.
No clear seasonal pattern shows up in sightings, and with a comfortable range of roughly 25 to 29C it stays on tropical reefs year-round, so any month works for a trip built around it.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most reliably logged in the Maldives, especially the Central Atolls, with strong numbers also recorded across Raja Ampat in Indonesia, Khao Lak in Thailand, and the Visayas in the Philippines. It also turns up consistently on Red Sea reefs around South Sinai and Marsa Alam in Egypt, and in Palau's Rock Islands.
Mapping where One-spot Snapper is logged…
The Maldives, particularly the Central Atolls, produces the most sightings, with Raja Ampat in Indonesia, Khao Lak in Thailand, and the Visayas in the Philippines also reliable. Red Sea sites around South Sinai and Marsa Alam in Egypt, plus Palau's Rock Islands, are other solid options.
There is no strong seasonal pattern in sightings, and it tolerates a wide tropical temperature range of roughly 25 to 29C, so it is present on reefs throughout the year.
Check for a silvery to pale grey-yellow body around 40 cm long with a single dark spot toward the rear of the back near the tail. It has a deep, laterally flattened body and usually holds a steady position just off the reef rather than schooling tightly.
They typically reach around 42 cm in length, a solid mid-sized snapper you will usually see as an adult on reef dives rather than in juvenile schools.
No, they are not considered a threat to divers and typically hold a calm, steady position near the reef when approached.
Although divers usually see it resting quietly near the reef by day, it is mainly a night hunter, feeding on small fish and invertebrates once darkness falls.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Emperor
2,055 sites
