Trachinops taeniatus
Small striped reef fish clouding temperate rocky reefs across New South Wales in 17.5-23.5C water, year-round and often in numbers.
Small, slender-bodied fish, usually seen hovering in loose schools just off the reef rather than sitting on it. Body is pale silvery-grey with a distinct dark stripe running along the flank from head to tail, and a translucent, almost see-through quality in good light. Fins are unmarked and understated, so the single lengthwise stripe is the feature to key on when sorting it from other small schooling reef fish.
Look for it hovering in loose, drifting schools a short distance above the reef structure, picking at drifting plankton rather than feeding off the substrate. It tends to hold station over rocky ledges and kelp-fringed reef rather than open sand, and divers report it as an easy, unhurried fish to approach without scattering the group. Most logs describe modest numbers rather than dense schools, so it reads as a steady background presence on a dive rather than a headline sighting.
Its schooling habit over structure, feeding on drifting plankton in the water column, makes it a reliable indicator of healthy current-swept temperate reef, even though no single sighting is usually dramatic.
Sightings are spread through the year with no clear seasonal gap, matching a water-temperature niche of 17.5 to 23.5C that covers both the cooler and warmer ends of the NSW diving calendar. Treat it as a year-round fish rather than one tied to a particular month.
This is a New South Wales speciality, logged across a long run of temperate reef sites there and effectively nowhere else in the data. Divers doing rocky reef and kelp-edge sites along the NSW coast have a strong chance of running into loose schools, with sightings most often described as uncommon to common rather than a guaranteed massive shoal.
Mapping where Eastern Hulafish is logged…
They are overwhelmingly a New South Wales fish, turning up on rocky reef and kelp-edge dive sites right along that coast. The data shows no meaningful population logged outside Australia, so NSW is the place to look.
There is no strong season in the sightings, and the fish is comfortable across a 17.5 to 23.5C range, so it is logged year-round on NSW reefs rather than during a specific window.
Look for a small, slender, pale silvery fish holding in loose schools just off the reef, with a single dark stripe running the length of its flank. The stripe and the mid-water hovering habit are the two things to check first.
No. They are a harmless small plankton feeder that tends to hold its ground calmly as divers pass, with no defensive or aggressive behaviour reported.
Exact size data is not available, but they sit firmly in the small end of temperate reef fish, seen as slim, modest-bodied fish schooling in the water column rather than any kind of large reef fish.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Barberfish
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