The golden perch (Macquaria ambigua) is a medium-sized, yellow or gold-coloured species of Australian freshwater fish found primarily in the Murray-Darling River system, though a subspecies is found in the Lake Eyre-Cooper Creek system, and another subspecies, suspected to be ancestral to all other populations, is found in the Fitzroy River system in Queensland. Other common names for golden perch are "goldens", “yellowbelly” and "callop".

Yellowbelly are an Australian native freshwater fish of the Murray Darling System and in the South is also known as Callop.
Golden perch are medium-sized fish, commonly 30–40 cm and 1–2 kg in rivers.
In the aquarium

Golden perch are not a true perch, which belongs to the genus Perca from the family Percidae, but a member of the Percichthyidae (temperate perch) family. This relatively widespread and widely stocked species is an important angling sport fish in Australia.