Parablennius tentacularis
A small, big-eyed blenny logged along Liguria, Istria and the French Riviera in water as cool as 16 to 22C. Here's where to find it.
A small, mottled brown to grey fish that rarely tops 10 cm, usually spotted perched on rock or resting in a crevice rather than swimming in open water. Look for the branched tentacle-like growths (cirri) above each eye, which give this blenny its name and separate it from smoother-headed reef fish. The body is stocky with a blunt head and large eyes set high, typical of the blenny family.
Divers find this blenny sitting still on rock ledges or tucked into small crevices, often at rest rather than actively foraging when spotted. It tends to hold its ground as divers approach rather than bolt, making it an easy subject for a close macro look if you move slowly. Expect an uncommon rather than reliable find, so scan rocky crevices carefully rather than expecting it in open water.
Those branched tentacles above the eyes aren't just decoration, they're thought to help break up the fish's outline against mottled rock, a bit of camouflage that works well for a species that spends most of its time sitting still.
No clear seasonal pattern shows in the data, and it's found across a temperature range of 16.1 to 21.7C, so it's a reasonable year-round sighting on Mediterranean rock reefs.
Most reliably logged along Italy's Liguria coast, with further sightings across Istria in Croatia, the Slovenian Coast and Occitanie and the French Riviera in France. It turns up on rocky Mediterranean reefs rather than sand or seagrass, so target rocky walls and boulder fields in these regions.
Mapping where Tentacled Blenny is logged…
It's most often logged in Liguria, Italy, and also turns up in Istria, Croatia, the Slovenian Coast, and France's Occitanie and French Riviera regions. Look for rocky Mediterranean reefs rather than sandy or open-water sites.
There's no strong seasonal pattern in the sighting data, and it's found across a fairly wide temperature range of 16.1 to 21.7C, so it can be seen on Mediterranean rock reefs at most times of year.
Look for a small brown to grey fish, about 10 cm, sitting still on rock rather than swimming freely. The giveaway is the branched tentacle-like growths above each eye, unusual even among blennies.
They stay small, typically around 10 cm long, which is normal for the blenny family and makes them an easy fish to overlook on a reef.
No. They're a harmless small reef fish that tends to hold still on rock rather than react defensively to divers.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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