Latropiscis purpurissatus
Rust-red and propped on its fins along New South Wales reefs, the Sergeant Baker turns up year-round in 18 to 24 C water.
Grows to around 42 cm and sits propped up on rocky ledges rather than swimming in open water, using its lower fin rays almost like small legs. Look for a slender, torpedo-shaped body in mottled red, pink and cream tones, a fairly large head with big eyes set high, and a sail-like first dorsal fin it can raise. The mottled camouflage pattern breaks up its outline against sponge and algae-covered rock, which is often the first clue you're looking at one rather than a random patch of reef.
Divers typically find it perched motionless on a rock, ledge or sandy gutter, propped up on its fins rather than cruising the water column. It relies on that stillness and mottled colouring to go unnoticed, often letting divers get close before flicking off to another perch a few metres away. Most sightings are on structure rather than in open water, so scanning ledges and reef bases close to the bottom is the way to spot one.
Its odd habit of resting propped up on stiffened fin rays, almost lizard-like, comes from its family (Aulopidae), sometimes nicknamed 'lizardfish relatives' for exactly this bottom-perching posture.
Sightings don't show a clear seasonal pattern, and it's recorded across a water-temperature range of roughly 18.4 to 24.4 C, so it's reasonable to expect this fish on New South Wales reefs at any time of year.
This one is very much a New South Wales speciality, logged at reef and rocky-shore sites right along that coast, with a much smaller scatter of sightings in Western Australia and South Australia. If you're diving temperate NSW reefs, from Sydney's rocky headlands down to the south coast, it's a realistic uncommon-to-common find rather than a rarity.
Mapping where Sergeant Baker is logged…
New South Wales, Australia is by far the strongest region for this species, with sites recorded from Sydney's rocky reefs down the south coast. Smaller numbers have also been logged in Western Australia and South Australia.
There's no strong seasonal pattern in the data, and it's recorded in water from about 18.4 to 24.4 C, so it turns up on New South Wales reefs throughout the year rather than in one particular season.
Look for a slender, red-and-cream mottled fish around 40 cm long, propped up on rocky ledges or gutters rather than swimming freely. Its raised, sail-like front dorsal fin and habit of resting motionless on the bottom are the key giveaways.
They typically reach around 42 cm in length, making them a solid mid-sized reef fish rather than a tiny cryptic species.
No, they pose no danger to divers. They're a docile bottom-dwelling fish that will simply move off to another perch if approached too closely.
Rather than swimming continuously, they prop themselves up on stiffened fin rays like a small stand, a trait shared with other members of the Aulopidae family. This lizard-like resting posture is a quick way to tell them apart from typical free-swimming reef fish.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Soldierfish
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