Pseudochromis fuscus
Small orange-brown reef fish darting through rubble in Java, Indonesia, in water around 25-29C, year-round.
A small, slender fish around 7 cm long, usually seen in shades of yellow-brown to orange with a faint dark line running through the eye. It has the classic dottyback shape: an elongated body, a single long dorsal fin, and a slightly pointed snout. Colour can shift depending on habitat, sometimes reading more olive or greyish, but the compact size and quick, jerky swimming give it away before markings do.
Look for it darting between coral heads and rubble patches, often ducking into a crevice the moment it feels watched. It tends to hover close to shelter rather than out in the open water, making short, twitchy movements rather than cruising. Divers log it as uncommon even at sites where it's present, so patience and a slow scan of the reef base pays off more than searching mid-water.
Dottybacks are known for aggressive, territorial behaviour well out of proportion to their size, often chasing off much larger fish from a patch of reef they've claimed as home.
No clear seasonal pattern shows up in the data, and with a comfortable range of 25.3 to 29.0C it's a year-round resident on the tropical reefs where it lives. Any time you're diving Java or the Visayas, conditions suit it.
Most reliably logged on reefs around Java, Indonesia, with further sightings across the Visayas in the Philippines and Sulawesi, Indonesia. A smaller number of divers have also recorded it off Western Australia, so it turns up across a wide stretch of the Indo-Pacific even if it never dominates a dive site.
Mapping where Dusky Dottyback is logged…
It's most commonly logged around Java in Indonesia, with additional sightings in the Visayas region of the Philippines and on reefs in Sulawesi and Western Australia.
There's no strong seasonal pattern in the sightings data, so it's considered a year-round species on the warm reefs it inhabits, comfortable between roughly 25 and 29C.
Look for a small, slender fish around 7 cm long in yellow-brown to orange tones, with a faint dark eye stripe and a single long dorsal fin. It moves in short, darting bursts close to rubble and coral cover rather than swimming openly.
They're small, typically reaching around 7 cm in length, making them easy to overlook against busy reef backgrounds.
No, they pose no danger to divers. They're too small to be a concern and simply retreat into the reef when approached.
Like other dottybacks, they're known for defending a patch of reef with surprising aggression, sometimes chasing off fish many times their own size.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Soldierfish
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