Trichonotus elegans
Slender, eel-like fish that hovers over sandy slopes in the Visayas and Bali, in warm 25-29C water year-round.
Slim, almost eel-like body about 13 cm long, usually seen hovering nose-up just above open sand rather than resting on the bottom. Look for a pale, sandy-brown body with faint darker markings running along the sides and a slightly elongated snout. Males typically show more contrast and pattern on the dorsal fin when displaying, while at rest the fish looks plain and easy to miss against the sand.
Spends most of its time hovering just above the sand with its body angled upward, feeding on tiny drifting plankton rather than digging or scavenging. It reacts quickly to divers, dropping into a burrow in the sand at the first sign of a close approach, so a slow, low approach from a distance gives the best chance of a lasting look. Most sightings come from calm sandy patches bordering reef slopes rather than the reef structure itself.
Unlike most bottom-dwelling gobies and blennies, this species feeds by hovering in the water column and picking off plankton, which is why it is usually seen suspended above the sand rather than perched on it.
No clear seasonal pattern shows up in the data, and with a comfortable temperature range of roughly 24.6 to 28.8 C, it appears to be a year-round sighting on tropical sand slopes.
Most reliably logged on sandy slopes in the Visayas region of the Philippines, with additional sightings in Bali, Indonesia. Both areas offer repeat opportunities, though this is not a fish you will find on every dive; it takes a patient look over open sand patches near reef edges.
Mapping where Elegant Sand-diver is logged…
Best chances are on sandy slopes in the Visayas region of the Philippines, with additional sightings around Bali, Indonesia. Look for open sand patches near reef edges rather than the reef itself.
There is no strong seasonal pattern in sightings, and it tolerates a broad tropical range of about 24.6 to 28.8 C, so it turns up on sandy slopes throughout the year.
Look for a slender, eel-like fish around 13 cm long hovering nose-up just above sand rather than resting on it. Its pale sandy colouring and faint side markings make it easy to overlook until it moves.
They reach about 13 cm in length, giving them a slim, almost thread-like profile in the water.
No. They are small, shy fish with no risk to divers, and they retreat into the sand well before anyone gets close.
Rather than picking food off the bottom like most gobies, they hover in open water above the sand to catch drifting plankton, which is why divers usually spot them suspended mid-water over sand flats.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Slender Goby
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