Microlipophrys nigriceps
A 2cm rockpool regular common across Croatia's Kvarner and Istria coasts, comfortable in 17.6 to 21.3C water year-round.
Tiny, at just 2cm long, with a stubby body that sits propped on its pectoral fins against rock rather than swimming freely. Look for the dark, almost black head that gives it its name, contrasting with a paler, mottled brown or olive body. It has no real dorsal crest to speak of, which helps separate it from some other small Mediterranean blennies, and it tends to freeze against the substrate rather than dart away.
Spend most of your time looking down and close to rock rather than out into open water, since this one hugs crevices and encrusted surfaces in the shallows, rarely below 6 metres. It tends to hold still or make short hops between perches rather than swim in the open, grazing on algae and tiny invertebrates on the rock surface. Divers and snorkellers usually spot it during slow, close-focus passes over shallow reef rather than on a typical mid-water dive.
Its whole world is the top few metres of rocky reef, so it is one of the few Mediterranean fish you are just as likely to find snorkelling as diving.
No clear seasonal pattern shows up in the data, and given it tolerates a fairly wide 17.6 to 21.3C range, it is a reasonable year-round find on shallow Mediterranean rock and reef.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
This is a shallow-water Mediterranean species, most reliably logged in Croatia, especially around Kvarner and Istria, which together account for the bulk of sightings. Spain's Balearic Islands and mainland regions like Valencia and Catalonia are also strong, with the French Riviera and Provence and Italy's Sicily and Liguria rounding out the picture.
Mapping where Black-headed Blenny is logged…
Croatia is the strongest hotspot, particularly Kvarner and Istria, followed by Spain's Balearic Islands, the French Riviera and Provence, and parts of Italy including Sicily and Liguria.
There is no strong seasonal signal in sighting data, and its comfortable temperature range of 17.6 to 21.3C means it is present in shallow Mediterranean water throughout the year.
Look for a tiny fish, about 2cm, perched on shallow rock with a distinctly dark, blackish head against a paler mottled body. It stays close to the substrate and tends to freeze rather than flee when approached.
Around 2cm, making it one of the smallest fish you will find on a Mediterranean rocky reef or in a shallow snorkelling spot.
No, it poses no danger to divers or snorkellers and simply keeps to its rocky perch when approached.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Klipfish
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