The golden trevally, Gnathanodon speciosus, is a species of large marine fish classified in the jack and horse mackerel family Carangidae,and the only member of the genus Gnathanodon. The golden trevally is widely distributed throughout the tropical and subtropical waters of the Indian and Pacific Oceans,ranging from South Africa in the west to Central America in the east, extending to Japan in the north and Australia in the south.
The species predominantly occupies inshore waters where it inhabits both reef and sandy substrates. The golden trevally is easily distinguished from its relatives by its fleshy, rubbery lips and unique colouration,which ranges from bright yellow with black bars as a juvenile to a golden-silvery colour as an adult. It is known to grow to 120 cm in length and 15 kg in weight. Several Asian countries currently farm the fish in caged aquaculture. Due to their brilliant colouration, juveniles are popular in marine aquaria.