Glowfish – Facts and Photographs

Shoal of Glowfish Gnathodentex aureolineatus on Mafia island tanzania

The glowfish Gnathodentex aureolineatus is also known as the  goldspot seabream or striped large eye bream. Glowfish are a species of emperor and get their name from the conspicuous yellow blotch just behind the dorsal fin. It is the only known member of its genus.

APPEARANCE

Glowfish seem to be able to vary their color, when over lighter colored areas they are mostly silver with horizontal yellow stripes on the sides but they can darken to a reddish brown with silver spots on each scale. It has a thin yellow moustache over the top lip with a line partially up the middle of the nose. The yellow blotch behind the dorsal fin almost seems to glow and possibly has reflective capabilities, so brightly does it seem to shine. They grow up to 30 cm but 20 cm is more common. In proportion to their size the eye is quite large as is to be expected with a nocturnal feeder.

Shoal of Glowfish Gnathodentex aureolineatus on Mafia island tanzania

IN THE WILD

They can be very curious of divers and will approach and mill around in front of one before moving off in an unhurried fashion.

HABITAT

Glowfish are found across the Indo-Pacific area from Somalia to South Africa across to the Pacific islands excluding Hawaii.

They are usually found on coral reefs at depths of 3 to 100 meters and are often seen over the reef in shoals of around a hundred fish during the day but can also be seen solitary or in small groups hiding in caves or under ledges.They split up during the night to feed.

Shoal of Glowfish Gnathodentex aureolineatus on Mafia island tanzania

DIET

Glowfish are mainly nocturnal feeders, feeding on sand dwelling invertebrates, crustaceans and small fish.

REPRODUCTION

Nothing is known about their breeding habits.

Glowfish Gnathodentex aureolineatus on mafia island tanzania

 

COMMERCIAL EXPLOITATION

They are edible but do not seem to be commercially exploited to any degree.

CLASSIFICATION

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Lethrinidae
Genus: Gnathodentex
Species: G. aureolineatus

LITERATURE CITED

https://en.wikipedia.org/wiki/Gnathodentex_aureolineatus

The Reef Guide
Denis King and Valda Fraser

Coastal Fishes of Southern Africa
By Phillip C. Heemstra, Elaine Heemstra

EQUIPMENT USED

Canon 7D

Ikelite 7D Housing

Twin Ikelite DS 161 Strobes

Flat Ikelite Lens Port

Ikelite Dual Synch Cord 

Ikelite 5.1 inch Port body

IMAGES

Glowfish Gnathodentex aureolineatus on Mafia Island

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