Bullseye Wriggler

Xenisthmus Polyzonatus
Bullseye Wriggler - Marinewise © 2026 MarineWise

Quick Facts

Scientific name Xenisthmus Polyzonatus
Other names Barred Wriggler
Size Up to 7 cm (3 in)
Weight A few grams

Distribution

Habitat & AU Distribution Coastal waters, lagoons & inshore reefs amongst sandy & rubble areas near reef edges
Depth Range 2 - 50 m (164 ft)
Bullseye Wriggler Distribution

Interesting Info

  • The Bullseye Wriggler is found widely across the Indo-Pacific, from the Red Sea and East Africa through Southeast Asia to northern Australia and the Great Barrier Reef.
  • Its body is slender and pale, marked with bold dark vertical bars and a distinctive large black “bullseye” spot at the base of the tail.
  • The head is speckled with small reddish to brown spots, giving it a camouflaged look against reef rubble.
  • They prefer shallow reef flats, lagoons, and sandy patches near coral rubble, where they can hide quickly if threatened.
  • Bullseye Wrigglers are cryptic and fast-moving, darting into crevices or burying in sand when disturbed.
  • They are carnivores, feeding on tiny crustaceans, worms, and other invertebrates picked from sand and rubble.
  • These fish are often seen in pairs or small groups, hovering close to the reef bottom.
  • Breeding is little studied, but they are likely to be egg-layers that deposit eggs on reef surfaces, with males guarding them until they hatch — similar to goby relatives.
  • Divers and snorkellers can sometimes spot them tail flicking and wriggling near sandy channels, but they are easily overlooked due to their size and camouflage.
  • The lifespan is not well documented, but similar small wriggler and goby species live 1–3 years.
Species Interaction

Snorkeling & Diving

The Bullseye Wriggler’s main interaction with people is through diving and snorkelling, where keen-eyed reef watchers can spot them darting around sandy rubble zones. Their distinctive tail spot makes them easier to identify once you know what to look for.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Xenisthmidae

Genus: Xenisthmus

Species: Xenisthmus polyzonatus

Conservation Status

According to the International Union for Conservation of Nature (IUCN), the conservation status of the Bullseye Wriggler fish, is currently categorised as “Least Concern”. This means that the species is not currently at risk of extinction, but its population and habitat should continue to be monitored to ensure that they remain stable.

Recreational Viewing
- Snorkeling & Scuba

Finding: Difficult

Temperament: Peaceful

Location: Inner Reef, Outer Reef, Lagoon

Danger: None