The golden perch (Macquaria ambigua) is a medium-sized, yellow or gold-coloured Australian freshwater fish species 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. Golden perch are not a true perch of the genus Perca, but a member of the Percichthyidae (temperate perches) family.