Animal Species:Threespot Humbug, Dascyllus trimaculatus (Ruppell, 1829)
Threespot Humbug are blue-black with dark scale margins. Juveniles have a white spot on the forehead and one on the side of the body. It occurs in tropical marine waters of the Indo-West Pacific
Standard Common Name
Threespot Humbug are blue-black with dark scale margins. Juveniles have a white spot on the forehead and one on the side of the body. As an individual ages, the forehead spot disappears and the spot on the side of the body becomes indistinct or disappears.
The species grows to 13 cm in length.
It occurs in tropical marine waters of the Indo-West Pacific, from the Red Sea, throughout South-east Asia and Micronesia, north to Japan, south to Australia and east to the Pitcairn Islands. In Australia the Threespot Humbug is known from the north-western coast of Western Australia and the northern Great Barrier Reef, Queensland, south to southern New South Wales and Lord Howe Island.
The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums. Click on the map for detailed information. Source: Atlas of Living Australia.
Distribution by collection data
It inhabits lagoons and coral reefs. Juveniles are often associated with large sea anemones and are sometimes seen with Anemone fish. As they grow, Threespot Humbug lose the ability to live in anemones. Adults occur in small to large aggregations. The species occurs in depths from 1m to 55m.
Feeding and Diet
The species feeds on algae, copepods and other planktonic crustaceans.
- Allen, G.R. 1975. Damselfishes of the South Seas. TFH Publications. Pp. 237. Allen, G.R. 1991. Damselfishes of the World. Mergus. Pp. 271.
- Allen, G.R. 1997. Marine Fishes of Tropical Australia and South-east Asia. Western Australian Museum. Pp. 220.
- Myers, R.F. 1999. Micronesian Reef Fishes. Coral Graphics. Pp. 330.
- Randall, J.E., Allen, G.R. & R.C. Steene. 1997. Fishes of the Great Barrier Reef and Coral Sea. Crawford House Press. Pp. 251.
Mark McGrouther , Collection Manager, Ichthyology