The gold saum (Andinoacara rivulatus, syn. Aequidens rivulatus) is a colorful freshwater fish in the cichlid family. The fish originates from the Pacific side of South America in the coastal waters from the Tumbes River in Peru to the Esmeraldas River in Ecuador. Males and females may reach lengths of 30 cm (12 in). Females are sexually mature at around 12 cm (4.7 in). In nature, A. rivulatus lives in a tropical climate and prefers water with a 6.5–8.0 pH, a water hardness of 25.0 dGH, and a temperature range of 20–24 °C (68–75 °F).