Oneline Wrasse

Labrichthys Unilineatus
Oneline Wrasse - Marinewise © 2023 MarineWise

Quick Facts

Scientific name Labrichthys Unilineatus
Other names Tubelip Wrasse, Tubemouth Wrasse, Yellow-lined Wrasse, Single-line Wrasse
Size Up to 20 cm (7.87 in)
Weight Up to .20 kg (.44 lb)


Habitat & AU Distribution Coastal waters amongst thick coral areas in lagoons & seaward reefs
Depth Range 1 - 30 m (100 ft)
Oneline Wrasse Distribution

Interesting Info

  • The Oneline Wrasse can be found in various locations around Australia, including the waters around the Great Barrier Reef, the Coral Sea, and coastal areas of New South Wales and Queensland. It is commonly found in the north eastern part of Australia.
  • The Oneline Wrasse has a slender body with a blue-green coloration on the upper half and yellowish coloration on the lower half.
  • It is a diurnal species, which means it is active during the day and rests at night.
  • The Oneline Wrasse feeds on small invertebrates, such as crustaceans, worms, and molluscs. It has a protrusible mouth that it uses to capture its prey.
  • During breeding season, males can display intense colours, with bright blue and green patterns.
  • The Oneline Wrasse breeds by laying demersal eggs, which means the eggs are deposited directly onto the substrate, such as rocks or coral. The male fish guards the eggs until they hatch. After hatching, the larvae are planktonic, drifting in the water column until they are large enough to settle on the substrate.
  • There is limited information on their lifespan, but similar species of wrasse in the Labridae family have been known to live up to 15 years.
Species Interaction

Aquarium, Snorkeling & Diving

The Oneline Wrasse is not commonly kept in aquariums, as they are aggressive towards other fish. The Oneline Wrasse is generally not aggressive towards humans and can be a common sight for snorkelers and divers in the waters around the Great Barrier Reef and other coral reefs in Australia.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Labridae

Genus: Labrichthys

Species: Labrichthys Unilineatus

Conservation Status

The Oneline Wrasse is not listed under any conservation status in Australia by the International Union for Conservation of Nature (IUCN). This means that, based on current knowledge, the species is not at significant risk of extinction and has a relatively stable population in its natural habitat.

Oneline Wrasse
As Aquarium Fish

Care Level: Moderate

Temperament: Aggressive

Diet: Carnivore

Reef Compatible: Yes

Minimum Tank Size: 100 gallons

Recreational Viewing
- Snorkeling & Scuba

Finding: Easy

Temperament: Aggressive

Location: Inner Reef, Outer Reef, Lagoon

Danger: None

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