Parablennius intermedius
A tiny, big-eyed reef fish common on rocky ledges in New South Wales, spotted year-round in mild 22 to 28C water.
A small, blunt-headed fish, rarely more than 8 cm, with a mottled brown-and-cream body that blends into rock and rubble. The giveaway is a pair of small fleshy tufts (cirri) above the eyes, which is where the common name comes from. It sits propped on its pelvic fins rather than swimming freely, and its eyes sit high and forward like a tiny bulldog watching the reef.
Look for it wedged into a crevice or perched motionless on a ledge, using its pelvic fins like little props rather than cruising open water. It holds its ground when divers approach, often just watching rather than bolting, which makes it an easy subject for a slow, patient photographer. Most sightings are on shallow rocky reef between 1 and 10 metres, tucked among algae and rubble where its colouring disappears.
Those head tufts are not just decoration; blennies use subtle differences in cirri shape and pattern as one of the few visual cues that separate closely related species, since many blennies otherwise look near-identical at a glance.
Sightings show no clear seasonal pattern, and with a comfortable range of roughly 22 to 28C it turns up on New South Wales reefs across the year rather than in one narrow window. Treat it as a year-round find rather than a seasonal target.
This is a distinctly Australian sighting, logged almost entirely on rocky reef sites in New South Wales, with a smaller but reliable presence further north in Queensland. New South Wales, particularly around Sydney and the state's temperate reef systems, is by far the most consistent place to find one.
Mapping where Horned Blenny is logged…
It is most reliably found on rocky reef sites in New South Wales, Australia, with additional sightings further north in Queensland. Outside Australia it has not been logged with any regularity by divers.
There is no strong seasonal pattern in sightings, and it tolerates a fairly wide temperature range of about 22 to 28C, so it is seen on New South Wales reefs throughout the year.
Look for a small, mottled brown fish under 8 cm perched on a ledge rather than swimming, with a blunt head and small fleshy tufts above each eye. It relies on camouflage against rock and rubble, so it is often spotted only once it moves.
They are small reef fish, typically reaching around 8 cm in length, which keeps them easy to overlook against rocky, algae-covered reef.
No, they pose no threat to divers. They are shy, small-bodied fish that hold still on the reef and have no venomous spines or aggressive behaviour towards people.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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