Ruanoho whero
A small reef fish logged across North Island, New Zealand, in water from 13 to 20.3C, mostly spotted resting on rock and rubble.
A tiny fish, around 6 cm, that perches propped on its pelvic fins rather than swimming freely like most reef fish. Look for the raised third dorsal fin (the trait that gives triplefins their name) and a mottled, patchy body pattern that blends into rock and rubble. It tends to sit dead still, angled slightly upward, watching rather than cruising.
Divers typically find it perched motionless on rock, rubble, or low reef structure, using its pelvic fins like a tripod rather than swimming in open water. It holds its ground when approached slowly, relying on its blotchy camouflage to disappear against the substrate rather than bolting. Most sightings come from close, patient looking rather than spotting it from distance.
Like other triplefins, it lacks a swim bladder, which is exactly why it spends its time perched on the bottom instead of hovering in the water column like most small reef fish.
Sightings are logged year-round with no clear seasonal peak, which fits its cool-water niche of roughly 13 to 20.3C. Plan around North Island dive conditions generally rather than chasing a specific month.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
This one is a North Island, New Zealand fish through and through, with every logged sighting coming from sites there. If you are diving temperate rock and reef around the North Island, this is a realistic species to tick off, most often logged as an uncommon find rather than a guaranteed one.
Mapping where Spectacled Triplefin is logged…
It is a North Island, New Zealand speciality, logged across a range of rocky reef sites there. Outside New Zealand it has not been recorded by divers in the data, so treat it as a local specialty rather than a widespread species.
There is no strong seasonal pattern in sightings, so it is considered a year-round find in its cool-water range of roughly 13 to 20.3C. Dive whenever North Island conditions suit you rather than waiting for a particular season.
Look for a tiny, 6 cm fish perched motionless on rock or rubble rather than swimming, with a raised third dorsal fin and a mottled, camouflaged body. It braces on its pelvic fins in a slightly upward-angled resting posture.
They stay small, reaching only around 6 cm, which along with their camouflage makes them easy to swim past unless you are looking closely at the substrate.
It is logged as uncommon at most sites where divers find it, with common sightings at only a handful of locations. Its blotchy pattern and habit of sitting still on rock make it easy to overlook, so slow, close-focus looking pays off.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Klipfish
1,860 sites
