Pristiapogon exostigma
Small reef cardinalfish with a dark eye stripe, most reliably logged around Viti Levu, Fiji, in warm 25-29 C water year-round.
A stocky little cardinalfish around 8 cm, reddish-brown to tan with a dark diagonal stripe slashing through the eye like smudged makeup, which is where the name comes from. A faint dark spot often sits near the base of the tail. Look for it hovering nose-first into cracks and overhangs rather than swimming in the open, with big dark eyes typical of the family.
Expect to find it tucked under ledges, in coral crevices, or hovering close to structure rather than cruising open water, often in small loose groups with other cardinalfish. It is a slow, unhurried swimmer that tends to hold its position and let divers approach rather than bolt, especially during the day when cardinalfish are typically less active. Night dives often reveal more movement as it and its relatives spread out to feed.
Like other cardinalfish, males of this genus are mouthbrooders, carrying the fertilised eggs in their mouth until they hatch rather than leaving them on the reef.
No clear seasonal pattern shows up in the data, and with a comfort range of 25.3 to 29 C it stays active on tropical reefs all year, so any month works in these regions.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most consistently logged around Viti Levu in Fiji, which accounts for the bulk of sightings, with further reliable records in Sulawesi, Indonesia, the Red Sea Riviera and Marsa Alam area of Egypt, and Kwajalein Atoll in the Marshall Islands. Across all these regions it turns up as an uncommon but steady find rather than a headline species.
Mapping where Eyeshadow Cardinalfish is logged…
Best chances are around Viti Levu in Fiji, plus Sulawesi in Indonesia, the Red Sea Riviera and Marsa Alam in Egypt, and Kwajalein Atoll in the Marshall Islands. It shows up as an uncommon sighting at most of these sites rather than something guaranteed on every dive.
There is no strong seasonal pattern in the sightings, and its warm-water comfort range of roughly 25 to 29 C means it is present on tropical reefs throughout the year.
Look for a small reddish-brown fish around 8 cm long with a dark diagonal stripe running through the eye and a faint dark mark near the tail base. It usually sits still near crevices and overhangs instead of swimming in open water.
They max out around 8 cm, which is typical for a small reef-dwelling cardinalfish and part of why they are easy to overlook against coral and rubble.
No. They are a small, harmless reef fish that pose no risk to divers and will simply hold their position or retreat slightly if you get close.
Males are mouthbrooders, holding the fertilised eggs in their mouth until the young hatch, a trait shared across most cardinalfish species.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Iridescent Cardinalfish
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