Red-lined Wrasse - Halichoeres biocellatus

Red-lined Wrasse (Halichoeres biocellatus)

The Red-lined Wrasse, Halichoeres biocellatus, is a colourful Western Pacific reef fish recognised by its fine red-orange body lines and distinctive dark, pale-edged eyespots on the dorsal fin. Also known as the False-eyed Wrasse, Biocellate Wrasse or Two-spotted Wrasse, it naturally inhabits coral and rocky reef slopes broken by rubble and sandy patches. This active daytime hunter searches continuously for small crustaceans, worms and other benthic invertebrates. Its manageable adult size, attractive changing colouration and generally peaceful temperament make it a desirable choice for established reef aquariums with a suitable sand bed.

Common Name:
Red-lined Wrasse, Red Line Wrasse, False-eyed Wrasse, Biocellate Wrasse, Biocellated Wrasse, Two-spotted Wrasse.

Scientific Name (Latin):
Halichoeres biocellatus

Maximum Size:
Usually around 10–12 cm when fully grown.

Water Type:
Marine

Origin / Natural Habitat:
Western Pacific, ranging from southern Japan and the Philippines through Indonesia, Papua New Guinea and surrounding Pacific islands, southwards to northern and eastern Australia. Red-lined Wrasses inhabit seaward reefs, reef crests and slopes at depths of approximately 6–35 metres. They favour mixed coral, rock and rubble habitats with patches of sand into which they can retreat.

Water Parameters:
Temperature: 24–28°C
pH Range: 8.1–8.4
Hardness or Salinity: Marine salinity 1.023–1.026 specific gravity; maintain stable salinity, alkalinity, good oxygenation and consistently high water quality.

Temperament:
Generally peaceful to moderately assertive. Red-lined Wrasses usually coexist well with suitably sized community reef fish, although established adults may become territorial towards other Halichoeres wrasses or similar sand-sleeping species. Avoid very aggressive tank mates that may intimidate them, as well as exceptionally timid fish that may be disturbed by their active feeding behaviour.

Diet:
Carnivorous benthic hunter. In the wild, this species feeds on small crustaceans, worms, molluscs and other tiny invertebrates collected from rockwork and the substrate. In the aquarium, offer enriched mysis shrimp, Artemia, copepods, finely chopped krill, prawn, clam and quality marine pellets or flakes. Feed small portions at least twice daily to support its active metabolism.

Minimum Tank Size:
A minimum aquarium volume of approximately 200 litres is recommended for one adult, with a broad area of open swimming space, established live rock and a suitable sand bed. A larger aquarium is advisable when maintaining it alongside other wrasses.

Behaviour & Activity:
An active daytime wrasse that spends much of its time moving across the lower and middle areas of the aquarium while inspecting rockwork and the substrate for food. When frightened or ready to sleep, it dives into the sand and may remain buried until daylight returns. Newly introduced specimens may remain beneath the substrate for several days while acclimating.

Juveniles and females display prominent dark eyespots on the dorsal fin, which may help confuse predators. As the fish matures, colouration can change considerably, with males developing stronger longitudinal red markings and the dorsal eyespots becoming less obvious.

Reef Safe:
Reef Safe with Caution

Red-lined Wrasses do not normally consume coral tissue and are generally compatible with established corals, anemones and clams. However, small ornamental shrimps, tiny crabs, feather duster worms, tubeworms, small snails and other mobile invertebrates may be investigated or eaten. They may also reduce populations of worms, copepods and other beneficial microfauna within the aquarium.

Special Requirements or Care Notes:
Provide a bed of fine, soft sand at least 5 cm deep so the fish can bury itself safely when sleeping or alarmed. Coarse, sharp or crushed-coral substrates can damage the skin and should be avoided. Position rockwork securely on the aquarium base before adding sand, as repeated burying activity may disturb loose structures.

A tightly fitted aquarium cover or fine mesh lid is essential because Red-lined Wrasses are highly capable jumpers. Do not attempt to uncover a newly introduced fish, as remaining buried for several days can be normal. Introduce competing Halichoeres wrasses carefully and provide multiple feeding areas and retreats. Although this species may consume certain nuisance worms or pyramidellid snails, it should not be purchased solely as a guaranteed form of pest control.

Suitable for:
Beginner to intermediate marine fishkeepers

Availability:
Occasional in trade

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.