Blotched Tripodfish

Pseudotriacanthus Strigilifer
Blotched Tripodfish - Marinewise © 2025 MarineWise

Quick Facts

Scientific name Pseudotriacanthus Strigilifer
Other names Longspined Tripodfish
Size Up to 25 cm (9.84 in)
Weight Up to .30 kg (.66 lb)

Distribution

Habitat & AU Distribution Coastal & brackish waters, estuaries amongst sandy, silty & muddy areas
Depth Range Up to 50 m (165 ft)
Blotched Tripodfish Distribution

Interesting Info

  • The Blotched Tripodfish is a small Indo-West Pacific fish known for its triangular body and long spines, not for deep-sea “tripod walking.”
  • It belongs to the family Triacanthidae, sometimes called “tripodfishes” because of their extended fin spines, though they are unrelated to the deep-sea spiderfishes of the same nickname.
  • In Australia, the Blotched Tripodfish is found across northern tropical waters—from Shark Bay in Western Australia, through the Northern Territory, to Queensland and the Great Barrier Reef.
  • The body is deep and compressed, covered with blotchy brown and yellow markings that help it blend into sandy and weedy habitats.
  • Its dorsal fin has very long, sharp spines, and the pelvic fins form a stout spine that can be propped against the seafloor for stability.
  • The name “tripodfish” comes from these extended spines, which can act like little stilts when the fish braces itself on sand or rubble.
  • It feeds mainly on small invertebrates—worms, molluscs, and tiny crustaceans—rooted out of the seabed with its small mouth.
  • Juveniles are more blotched and often hide among algae and rubble in estuaries and lagoons.
  • Blotched Tripodfish are sometimes caught as bycatch in small-scale trawl or trap fisheries but have no major commercial importance.
  • Their flesh is technically edible, but they are too small and bony to be targeted as food fish.
  • This species is the only member of its genus, making it unique among tripodfishes.
  • The scientific name strigilifer means “scraper bearer,” referring to the rough scales and ridges along its body.
Species Interaction

Snorkeling & Diving

The Blotched Tripodfish is a master of disguise in northern Australia’s shallows. Snorkel over a sandy estuary or coastal flat, and it might be right beneath you — silvery-grey, splashed with golden blotches, lying perfectly still against the seabed. They’re shy, solitary foragers, but spotting one in the wild is a true highlight for keen-eyed divers and snorkellers.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Tetraodontiformes

Family: Triacanthidae

Genus: Pseudotriacanthus

Species: Pseudotriacanthus Strigilifer

Conservation Status

The conservation status of the Blotched Tripodfish is currently listed as Least Concern by the IUCN. This reflects its wide Indo–West Pacific distribution, adaptability to coastal and estuarine habitats, and low targeted fishing pressure. However, habitat degradation from pollution, sedimentation, and coastal development could pose future risks. Limited monitoring means population trends are not well understood, making ongoing observation important for its long-term stability.

Fish Taste Quality

Blotched Tripodfish are edible and, while not a targeted food fish in Australia, they are consumed in parts of their Indo–West Pacific range, including Indonesia, India, and Southeast Asia, where they are often sold fresh in local markets.

Taste Rating: 2/5

How to catch
Blotched Tripodfish

Catch Difficulty: Easy

Tackle: Running Sinker Rig

Bait: Crab, Prawns, Squid, Worms, Yabbies

Technique: Keep bait on the bottom

Popularity: Not targeted - Bycatch

Blotched Tripodfish
As Aquarium Fish

Care Level: Easy to moderate

Temperament: Peaceful

Diet: Carnivore

Reef Compatible: No

Minimum Tank Size: 70 gallons

Recreational Viewing
- Snorkeling & Scuba

Finding: Easy

Temperament: Peaceful

Location: Seagrass Beds, Sandflats

Danger: Dorsal & Pectoral Spine