Pineapplefish, Cleidopus gloriamaris De Vis, 1882
The Pineapplefish has also been called the Knightfish.
The similar Japanese Pineapplefish, Monocentrus japonicus, also occurs in Australian waters. It can be distinguished from the Pineapplefish by its more rounded snout. It also has light organs on the lower jaw, but these are located on the ventral side near the front of the jaw, rather than on the sides.
The Pineapplefish is an unusual fish that can produce light from organs on the lower jaw.
The Pineapplefish is named for its pineapple-like appearance. It has robust scales with black margins. On either side of the lower jaw is a light organ that produces a greenish glow. The colour of the light is reported to change to red as the fish ages.
It is often observed by divers on shallow coastal reefs, but is also trawled in deeper offshore waters.
The species is recorded from the east and west coasts of Australia, but not from Victoria and South Australia.
The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums. Source: Atlas of Living Australia.
Feeding and diet
The Pineapplefish feeds at night. Its prey are detected by light emitted from the light organs on the sides of the lower jaw. Within the light organs symbiotic bacteria produce a greenish glow.
Other behaviours and adaptations
The species is reported to make a creaking sound when disturbed.
- Gomon, M.F., Glover, C.J.M. & R.H. Kuiter (Eds). 1994. The Fishes of Australia's South Coast. State Print, Adelaide. Pp. 992.
- Hutchins, B. & R. Swainston. 1986. Sea Fishes of Southern Australia. Complete Field Guide for Anglers and Divers. Swainston Publishing. Pp. 180.
- Kuiter, R.H. 1993. Coastal Fishes of South-Eastern Australia. Crawford House Press. Pp. 437.
- Kuiter, R.H. 1996. Guide to Sea Fishes of Australia. New Holland. Pp. 433.
- Nakabo, T. 2002. Fishes of Japan with pictorial keys to the species, English edition. Tokyo: Tokai University Press. Pp. lxi + 1749.
- Paxton, J.R., D.F. Hoese, G.R. Allen & J.E. Hanley. 1989. Zoological Catalogue of Australia Vol.7 Pisces Petromyzontidae to Carangidae. Canberra: Australian Biological Resources Survey. Pp. i-xii, 1-665.