科: Cyprinidae
长鳍马口鱲为鲤科鱼类，基本和平的群居鱼，原生分布于中国东部溪流。性情平和、食性杂，是混养缸里最省心的居民之一。成体约 6.8–9.9 cm，单养或小群均可，适宜水温 10–20 °C。稳水、换水、杂食，足矣。
Opsariichthys evolans is a Cyprinidae from eastern Chinese streams. Its calm temperament and broad diet make it one of the more forgiving residents of a community tank. It lives on the bottom. Adults reach 6.8–9.9 cm. Singly or in small groups depending on temperament. Stable water, regular partial changes and a varied diet cover nearly everything it needs. Maintain 10–20 °C at pH 6.5–7.5. Water quality and diet matter more than décor.