Scolopsis margaritifera
Spot this silvery reef fish with its trademark eye-ring on dives across Malaysia's east coast, Thailand and Raja Ampat year-round in warm 27-29 C water.
Grows to around 19 cm and shows a silvery to pale grey body with a faint iridescent sheen, often with a yellowish wash along the back. The giveaway is the pearly, spectacle-like ring around the eye that gives the species its name, plus a slightly sloping, pointed snout typical of monocle breams. It tends to hover just off the reef alone or in loose small groups rather than tight schools.
Usually seen picking around sandy patches and rubble at the reef edge, hovering low and nosing into the substrate for small invertebrates. It is not shy but keeps a steady distance from divers rather than approaching, and it is most often spotted singly or in small loose groups during the day rather than schooling tightly like some reef fish.
Its common name comes directly from that pale, pearly ring circling the eye, a feature shared across monocle breams but especially bright and glossy on this species.
No clear seasonal pattern shows up in the data, and with a comfortable range of 26.7 to 29.3 C it is present on these tropical reefs all year round.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most reliably logged along Peninsular Malaysia's east coast and Sabah, with strong numbers also across Thailand at sites like Koh Tao and Koh Lipe. It also turns up consistently in Palawan in the Philippines, Raja Ampat and Sulawesi in Indonesia, and on reefs in Queensland, Cambodia and Palau.
Mapping where Pearly Monocle Bream is logged…
It shows up most consistently on reefs along Peninsular Malaysia's east coast and Sabah, and it is also a regular sighting in Thailand around Koh Tao and Koh Lipe. Divers in Palawan, Raja Ampat, Sulawesi and Queensland log it too, usually as an uncommon to common find rather than a guaranteed one.
There is no strong seasonal pattern in sightings, and its warm-water niche of roughly 27 to 29 C means it is on the reef year-round at most of these tropical sites.
Look for a silvery, torpedo-shaped fish around 19 cm with a pale, pearly ring circling the eye. It usually hovers low near the reef edge or over sand rather than schooling tightly.
They reach around 19 cm in length, a modest size that keeps them easy to overlook against busier reef fish.
No, they pose no threat to divers and simply go about foraging near the reef bottom, keeping their distance if approached.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Melon Butterflyfish
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