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Apogon aureus refers to a species of fish commonly known as the golden cardinalfish. These fish belong to the family Apogonidae and are typically found in coral reefs and rocky areas of the tropical Indo-Pacific region. They are known for their striking golden coloration, which gives them their common name. Golden cardinalfish are relatively small in size, reaching up to about 8 centimeters in length. They are nocturnal feeders, often hiding among coral branches or in crevices during the day and becoming active at night to hunt for small invertebrates and plankton.