Vanneaugobius dollfusi
A rare, small goby found almost exclusively along France's Riviera and Provence coast, in cool water between 14 and 20 C.
A small, slender bottom-dweller with a mottled grey-brown body that blends into rocky and rubble seabed, making it easy to swim straight past. Look for the typical goby posture: propped on its pelvic fins, head slightly raised, motionless for long stretches near a crevice or under a rock ledge. Size is unrecorded for this species, but expect something in the small goby range, a few centimetres at most, so a slow scan of the substrate is needed to pick it out.
Expect to find it tucked low on rocky or rubble seabed, perched still near a crevice rather than swimming in open water. It's the kind of fish you notice only when you're already looking closely at the bottom, and at most sites divers log it as rare, with a handful of spots where it's merely uncommon. It doesn't react much to divers, likely relying on staying still and blending in rather than fleeing.
Its patchy, low-frequency sighting record across dozens of Riviera sites suggests it's a localised specialist of Mediterranean rocky habitat rather than a fish that's simply overlooked everywhere.
Sightings don't show a clear seasonal pattern, so treat it as a year-round possibility on Riviera and Provence dives. Observed water temperatures range from a cool 14.2 to 20.2 C, spanning much of the Mediterranean dive season from winter into summer.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Every logged sighting of this goby comes from France, and specifically from the French Riviera and Provence coast, which is currently the only known region to reliably find it. Divers exploring the rocky reefs and ledges of this stretch of the Mediterranean have the best shot at spotting one.
Mapping where Dollfus' Goby is logged…
Almost all recorded sightings come from France, concentrated along the French Riviera and Provence coast. It hasn't been documented as a reliable find elsewhere.
There's no detected seasonal pattern, so it's considered a year-round sighting on Riviera dives. It's been logged in water from 14.2 to 20.2 C, covering much of the region's diving calendar.
Look for a small, mottled brown-grey goby resting motionless on rocky or rubbly seabed near a crevice. Its camouflage and stillness make it easy to miss, so scan the substrate slowly rather than the open water.
Exact size data isn't recorded for this species, but like most gobies in its family it stays small, likely only a few centimetres long.
Yes, it's logged as rare at most sites where divers have recorded it, with only a smaller number of sites reporting it as uncommon. Even in its stronghold region, it takes a careful eye to spot one.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Slender Goby
803 sites
