Ring Slender Wrasse

Hologymnosus Annulatus
Ringed Slender Wrasse - Marinewise © 2025 MarineWise

Quick Facts

Scientific name Hologymnosus Annulatus
Other names Narrow Banded Rainbowfish, Ring Wrasse, Ringed Wrasse
Size Up to 4 cm (18 in)
Weight Up to 1.25 kg (2.75 lb)

Distribution

Habitat & AU Distribution Coastal waters amongst sandy & rubble areas next to seaward reefs
Depth Range 1 - 30 m (100 ft)
Ringed Slender Wrasse Distribution

Interesting Info

  • The Ring Slender Wrasse, is a long, torpedo-shaped wrasse found across the tropical Indo-Pacific. In Australia it occurs along the northern coast from Western Australia to Queensland, including the Great Barrier Reef and Coral Sea.
  • Males are especially eye-catching, with a bluish-green body marked by a series of bright yellow to orange “ring” patterns along the sides and a blue head with yellow bands.
  • Females and juveniles look completely different: they are pale green to brown with dark stripes running lengthwise along the body, helping them blend into sandy reef habitats.
  • The transformation from female to male includes a dramatic change in colour and patterning, making this one of the most visually striking examples of wrasse sexual dimorphism.
  • Like many wrasses, the Ring Slender Wrasse is a protogynous hermaphrodite, beginning life as a female before some transition to male dominance.
  • They are active daytime hunters that swim quickly over sandy flats and rubble zones, feeding on crabs, shrimps, molluscs, worms, brittle stars, and sea urchins.
  • Their long body and speed make them excellent open-water foragers, unlike many smaller wrasses that stick close to coral heads.
  • At night they retreat into reef crevices for safety, often lying motionless until morning.
  • Spawning occurs in pairs, usually at dusk, when males display their brilliant colours to attract females. The eggs are released into the open water and drift with the currents.
  • Juveniles are often found in very shallow sandy lagoons, hugging the bottom and using their striped pattern to camouflage against predators.
  • Ring Slender Wrasses can live for 8–10 years in the wild, with the largest males often being the oldest and most dominant individuals on the reef.
Species Interaction

Recreational Fishing, Aquarium, Snorkelling & Diving

Ring slender wrasse are often caught as bycatch for anglers targeting other species. They are typically a catch and release species. They are more know for their striking colours and are a popular species for aquariums and to observe in the wild for snorkelers and divers.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Labridae

Genus: Hologymnosus

Species: Hologymnosus Annulatus

Conservation Status

The conservation status of the ring slender wrasse in Australia is currently listed as “Least Concern” by the International Union for Conservation of Nature (IUCN). This means that the species is not considered to be at significant risk of extinction in the wild, although it may face localized threats such as habitat degradation and overfishing in some areas.

Fish Taste Quality

Ring slender wrasse are edible but are not targeted for consumption. They are considered bycatch and often released.

Taste Rating: na

How to catch
Ring Slender Wrasse

Catch Difficulty: Easy

Tackle: Running Sinker Rig

Bait: Crab, Fresh cut flesh baits, Pilchards, Prawns, Squid, Worms

Technique: Keep bait on the bottom, Keep bait close to the reef/structure

Popularity: Not targeted

Ring Slender Wrasse
As Aquarium Fish

Care Level: Easy to moderate

Temperament: Peaceful

Diet: Carnivore

Reef Compatible: Yes

Minimum Tank Size: 70 gallons

Recreational Viewing
- Snorkeling & Scuba

Finding: Easy

Temperament: Peaceful

Location: Inner Reef, Outer Reef, Lagoon

Danger: None