Yellowtail Demoiselle (species: Neopomacentrus azysron) in ALA: Lizard Island (Lizard Island Field Guide)
Neopomacentrus azysron
Yellowtail Demoiselle

©Anne Hoggett: Neopomacentrus azysron at Big Vicki's Reef, Lizard Island. Note yellow on rear of dorsal fin is connected to yellow of tail, and dark spot above pectoral fin.

©Andy Lewis: An adult Yellowtail Demoiselle

©Andy Lewis: A typical feeding school of Yellowtail Demoiselles.
Kingdom Animalia
Phylum Chordata
Class Actinopterygii
Order Perciformes
Family Pomacentridae
Genus Neopomacentrus
Species Neopomacentrus azysron



Distinguishing features

A small blue-grey fish with orange-yellow on the rear dorsal fin and a yellow tail, and a small dark "ear-spot" behind the eye. Usually seen schooling above corals in shallow water, often in mixed schools with Neopomacentrus cyanomos. N.azysron is distinguishable by the contiguous yellow which connects the rear of the dorsal fin with the tail, and the blue-grey as opposed to charcoal grey body colour. When the two species forage in mixed schools, the N. azysron usually aggregate together at the leading edge of the school, highest in the water column and furthest from shelter.


  • Up to 8 cm (Standard length)

Depth range

  • Depth range data is not yet available.


Similar taxa


©Atlas of Living Australia: Australian distribution

Distribution and habitat preferences

Found in nearly all habitats around the island, although most common in shallow lagoonal and backreef areas with abundant hard coral and good current flow.

Found in most locations around the Island.


The Yellowtail Demoiselle is a common plankton feeding damselfish found all around Lizard Island and throughout the GBR. It aggregates in large schools over the top of suitable hard coral shelter, and is commonly targeted by predators such as Trevallies and Rock Cods. Despite its abundance, there is little published information on the ecology of this species. Like other damselfish, the males establish a benthic nest and court females to encourage egg deposition, and the eggs hatch after a short incubation of 3-5d. The juveniles settle to the reef in large groups, and take up position next to the adult feeding schools. At Walker Reef, we found this species recruited in large groups to the backreef habitats during summer, and then progressively moved into the other lagoonal habitats during the early autumn. Populations of the Yellowtail Demoiselle appear to have rapid turnover which suggests this species is relatively short-lived.

Web resources


  • Arias-González, J.E., T.J. Done, C.A. Page, A.J. Cheal, S. Kininmonth and J.R. Garza-Pérez (2006). Towards a reefscape ecology: relating biomass and trophic structure of fish assemblages to habitat at Davies Reef, Australia, Marine Ecology Progress Series, 320: 29-41. LIRS catalog number 90099.
  • Bellwood, D.R., A.S. Hoey, J.L. Ackerman and M. Depczynski (2006). Coral bleaching, reef fish community phase shifts and the resilience of coral reefs, Global Change Biology, 12: 1587-1594. LIRS catalog number 90100.
  • Booth, D.J. (2002). Distribution changes after settlement in six species of damselfish (Pomacentridae) in One Tree Island lagoon, Great Barrier Reef, Marine Ecology Progress Series, 226: 157-164. LIRS catalog number 90094.
  • View all references