Unicorn Whiptail

Trachyrincus Longirostris
Unicorn Whiptail - Marinewise © 2026 MarineWise

Quick Facts

Scientific name Trachyrincus Longirostris
Other names Unicorn Rattail, White Whiptail
Size Up to 60 cm (23.62 in)
Weight Under 1.25 kg (2.75 lb)

Distribution

Habitat & AU Distribution Deepsea waters amongst soft bottom areas on the continental slope
Depth Range 200 - 1,000 m (3,280 ft)
Unicorn Whiptail Distribution

Interesting Info

  • The Unicorn Whiptail is a deep-sea rattail fish found off southern Australia, New Zealand, and across parts of the Indo-Pacific Ocean.
  • It gets its name from its long, pointed snout that looks a little like a unicorn’s horn.
  • Its body is elongated and ends in a whip-like tail, a trademark of rattails (grenadiers).
  • Colouration is generally grey-brown to silvery, helping it disappear in the deep-sea gloom.
  • The Unicorn Whiptail uses its elongated snout to probe sediment, rooting out small crustaceans, worms, and other invertebrates hidden in the mud.
  • It may also scavenge, feeding on bits of carrion that drift down from the upper ocean.
  • Its large eyes are adapted to detect faint traces of light, a survival advantage in the twilight depths.
  • Like other grenadiers, it has a sensitive lateral line system that picks up vibrations from nearby prey or predators.
  • The species is slow-growing and probably long-lived, with relatives in the rattail family known to live more than 20 years.
  • Predators may include deep-sea sharks, larger grenadiers, and big benthic fishes such as toothfish.
  • The Unicorn Whiptail is rarely studied, and most of what scientists know comes from deep-sea trawl surveys.
  • It is sometimes called the Long-snout Whiptail, highlighting its distinctive “unicorn” feature.
Species Interaction

Commercial Fishing, Elusive Species

The Unicorn Whiptail is not a target species for recreational or commercial fishing, it can occasionally be incidentally caught as bycatch in deep-sea fishing operations. Bycatch refers to the unintended capture of non-target species while fishing for other commercially valuable species. Due to the species’ deep-sea habitat, limited commercial value, and restricted range, direct human interactions with them are infrequent.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Gadiformes

Family: Trachyrincidae

Genus: Trachyrincus

Species: Trachyrincus Longirostris

Conservation Status

In Australia, the conservation status of the Unicorn Whiptail is classified as “Least Concern” according to the International Union for Conservation of Nature (IUCN). This indicates that the species is not currently facing significant threats or population decline.

How to catch
Unicorn Whiptail

Catch Difficulty: NA

Tackle: NA

Bait: NA

Technique: NA

Popularity: Not targeted - Commercial fishing bycatch

Elusive / Overlooked Species

Finding: Difficult

Temperament: Shy

Location: Deepsea

Danger: None