Lutjanus vitta
Uncommon but reliable on reefs at Koh Tao and Koh Chang, this striped snapper turns up year-round in 25 to 29 C water.
Look for a slim, torpedo-shaped snapper around 28 cm long, silvery to pale pink along the body with a distinct dark brownish stripe running from the eye to the tail. The stripe is the main giveaway, it sits above the midline and stays crisp even at depth, unlike the fainter or differently placed markings on similar reef snappers. Fins are usually a plain yellowish or translucent tone, and the head profile is pointed rather than blunt.
Usually seen hanging in loose small groups over reef slopes and rubble patches, hovering just off the bottom rather than tucked into cover. It keeps a wary but unbothered distance from divers, drifting off a few metres rather than bolting, and is often mixed in with other snapper or fusilier schools during the day.
Like most Lutjanus snappers it feeds mainly after dark, picking off small fish and invertebrates from the reef, which is why daytime encounters usually show it resting or loosely schooling rather than actively hunting.
No clear season shows up in the sightings, and its comfort range of 25.1 to 29.1 C matches tropical reefs year-round, so any month works at its core Thai and Australian sites.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most consistently logged in Thailand, especially around Koh Tao, Koh Chang and Krabi, where it turns up on reef dives as a background regular rather than a headline sighting. Outside Thailand it has a solid presence on Queensland's reefs in Australia and around Longdong in Taiwan, giving divers a reasonable shot at it across a broad swathe of the Indo-Pacific.
Mapping where Brownstripe Red Snapper is logged…
Thailand is the strongest spot, particularly Koh Tao, Koh Chang and Krabi, with further sightings around Queensland in Australia and Longdong in Taiwan.
There's no strong season in the data, and its warm-water preference of roughly 25 to 29 C holds year-round on tropical reefs, so it's a fair bet in any month at its main sites.
Check for a slim silvery-pink body around 28 cm long with a clean dark stripe running from eye to tail. The stripe sits high on the body and is the quickest way to separate it from similarly shaped reef snappers.
They typically reach around 28 cm, making them a mid-sized reef snapper you'll usually spot in small loose groups rather than large schools.
No, they're not considered dangerous and simply keep a cautious distance when divers approach.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Emperor
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