Parablennius tasmanianus
Small reef blenny logged mostly in Victoria, Australia, in cool 14 to 23 C water, usually spotted wedged into rocky crevices.
A small, blunt-headed fish around 9 cm long with a mottled brown to olive body that blends into rocky reef and kelp holdfasts. Look for the elongated dorsal fin running most of the body length and a pair of small cirri (fleshy tufts) above the eyes, typical of the blenny family. It usually rests propped on its pectoral fins against a rock face rather than swimming freely, which is often the giveaway.
Divers typically find it wedged into a crevice, ledge, or the base of a kelp holdfast rather than out in open water, using its pelvic fins to prop itself at an angle while it watches for food or intruders. It tends to hold its ground rather than bolt when a diver approaches slowly, making it an easy macro subject for anyone patient enough to scan rock crevices closely. Most sightings are logged as uncommon or rare, so a slow, methodical look along rubble and reef walls pays off more than a quick swim-by.
Like other blennies, it lacks scales and relies on a mucous coating and its cryptic colouring for protection, which is why it is so easy to swim straight past without noticing.
Sightings show no strong seasonal pattern, and the recorded temperature range of 14.2 to 22.8 C spans Victoria's cooler winter and warmer summer diving conditions alike, so it turns up on rocky reef dives year-round.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Almost all logged sightings come from Australia, with Victoria the clear stronghold, particularly the reefs and jetties around Port Phillip Bay and the wider Victorian coast. South Australia offers a smaller but reliable spread of sites. Outside these two states, records are scarce, so this is very much a temperate southern Australian species for divers to target.
Mapping where Tasmanian Blenny is logged…
Most sightings come from Victoria, Australia, especially reefs and jetty dives around Port Phillip Bay, with South Australia offering a smaller but consistent number of sites.
There is no clear seasonal pattern in sightings, and it turns up in water from about 14 to 23 C, so it is a year-round find on Victorian and South Australian reef dives.
Look for a small mottled brown fish around 9 cm long, propped against rock with its pectoral fins, with an elongated dorsal fin and small cirri over the eyes. It rarely swims far, sticking close to crevices and kelp holdfasts.
They reach around 9 cm in length, making them a small, easy-to-miss reef fish best spotted with a close, slow look along rock faces.
No, they pose no danger to divers. They hold their ground in crevices when approached but have no venom or aggressive behaviour toward people.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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