Golden Trevally – Facts and Photographs

golden trevally Gnathandon speciosus The golden trevally Gnathandon speciosus is also known as the golden kingfish, banded kingfish and in Hawaii it is called the yellow ulua or papio. It is a member of the horse mackrel or jack family.

GOLDEN TREVALLY APPEARANCE

Small juvenile golden trevally are very similar in looks to pilot fish and have vivid black and yellow stripes. They often accompany larger fish and sometimes even jellyfish for protection, mimicking the behavior of pilotfish. They are commonly seen swimming ahead of whale sharks on Mafia Island. Juveniles can be seen swimming with the whale shark in the image below.

whale shark mafia island with juvenile golden trevally

With age the yellow becomes more silver and the black bars fade, although they are still visible and several black spots appear. The fins retain a golden sheen making them quite distinctive. Their lips are more fleshy than their other close relatives. They grow up to 120 centimeters in length and can weigh up to 15 kilograms.

golden trevally Gnathandon speciosus

GOLDEN TREVALLY IN THE WILD

As adults they are often curious and will swim up to divers to eye them out. They often return several times to do this. Usually they will not easily let you get closer than a few meters before they swim off. They are powerful fish capable of swimming at a high speed.

GOLDEN TREVALLY HABITAT

The golden trevally is found across the Indo-Pacific area from the Red Sea and East Africa to the Hawaiian Islands and southeastern Oceania, north to Japan and south to Australia. The fish inhabits areas with sand or rubble adjacent to coral reefs at depths from 1 to 100 meters but can mostly be found between 5 to 30 meters.

golden trevally Gnathanodon speciosus

GOLDEN TREVALLY DIET

The golden trevally feeds during the day and they use their enlarged lips to siphon prey out the sand, filtering the sand through the gills. Crabs, shrimp and mollusks as well as small fish make up the majority of their prey. They will also chase down smaller free swimming fishes.

GOLDEN TREVALLY REPRODUCTION

The exact method of reproduction is not known but it is thought that the males initiate the females to drop their eggs into the water table and that they then release sperm into the water, fertilizing the eggs. The spawning takes place in the warmer months of whichever location they are in.

golden trevally Gnathandon speciosus

GOLDEN TREVALLY COMMERCIAL EXPLOITATION

The golden trevally is exploited commercially and in many areas is either near the level of maximum exploitation or is over fished. They are also fished as a game fish using lures and bait and put up a strong fight. The flesh is good eating and is a light pinky color which whitens when cooked.

GOLDEN TREVALLY CLASSIFICATION

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Suborder: Percoidei
Superfamily: Percoidea
Family: Carangidae
Genus: Gnathanodon
Species: G. speciosus

 
LITERATURE CITED

The Reef Guide fishes, corals, nudibranchs & other invertebrates
East and South Coasts of Southern Africa
Dennis King & Valda Fraser

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

 

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