科: Melanotaeniidae
石美人为虹银汉鱼科鱼类，和平但活跃，需要开阔泳动空间，原生分布于南美洲及菲律宾。虹彩是诚实的状态信号：体色与状态随水质与年龄一起变化。成体约 6.8–9.9 cm，群游性，8 尾以上长缸最佳，适宜水温 27–30 °C。缸要长，群要大，水要清。
Melanotaenia boesemani is a Melanotaeniidae from 南美洲及菲律宾. Its iridescence is honest signalling: colour and condition track water quality and age together. It lives on the bottom. Adults reach 6.8–9.9 cm. Shoaling; 8+ in a long tank unlocks full colour. Provide swimming length, clean hard water and a big school; patience does the rest. Maintain 27–30 °C at pH 7–8. A rewarding species for the aquarist who reads before buying.