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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 . Females are sexually mature at around . As the name implies, late juvenile-phase and adult-phase specimens can be very aggressive. This is not guaranteed, however, and peaceful individuals can be observed. Juveniles of ''A. rivulatus'' are often sold in aquarium stores. This species is not to be confused with the blue acara, ''Andinoacara pulcher'', which is similar in appearance; the blue acara is not as aggressive and does not grow as large as the gold saum. The fish is somewhat deep-bodied, possessing a prominent forehead. Adult males develop a pronounced forehead hump, composed of fatty tissue. Juveniles are tan colored with silver-blue flecks and lack the bright iridescent blue, green, and orange coloration and long, flowing fins of adult specimens. 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 . ==In the aquarium hobby== ''A. rivulatus'' is a popular fish in the aquarium trade and is noted for its hardiness, as well as its aesthetic appeal. These characteristics make it ideal for beginning aquarists or for enthusiasts who prefer to avoid managing the strict water parameters required for other fish species. They are ambitious eaters, and do well on a variety of foods including cichlid pellets, flakes, bloodworms, and shrimp. 〔http://www.aquariumslife.com/freshwater-fish/american-cichlid/green-terror-aequidens-rivulatus〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Green terror」の詳細全文を読む スポンサード リンク
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