科: Balitoridae
长尾后平鳅为爬鳅科鱼类，平和的啃食者，争斗只是短暂推挤，原生分布于中国南方山溪。吸盘状腹部为适应山溪急流而生，温暖静水对它比疾病更致命。成体约 4.5–6.6 cm，过于密集会不停推挤抢位，适宜水温 18–26 °C。水流、溶氧和低温，三者缺一不可。
Metahomaloptera longicauda, a member of the family Balitoridae, comes from southern Chinese mountain streams, where it inhabits fast-flowing mountain streams, clinging to rocks. Peaceful grazer; squabbles are brief pushes and algae and biofilm specialist; supplement with wafers, it grows to 4.5–6.6 cm and adapts well to a properly set-up aquarium in the 18–26 °C range. Other Metahomaloptera species in our database include Metahomaloptera omeiensis.
中等难度，稳定水质比高端设备更关键。Peaceful grazer; squabbles are brief pushes，Loosely social; crowding causes endless pushing。
水温控制在 18–26 °C，重点是稳定。Cool, highly oxygenated water。
成体约 4.5–6.6 cm；最小缸体 52 L，并留出活动空间。
Algae and biofilm specialist; supplement with wafers。建议人工饲料搭配冷冻或活饵，保证多样性。
Peaceful grazer; squabbles are brief pushes。推荐混养：Hillstream loaches of similar size — Graze side by side on open stone。避免与Warm-water community fish — Need different temperatures同缸。
分布于中国南方山溪：Fast-flowing mountain streams, clinging to rocks，Very strong, highly oxygenated current。
Breeding rarely reported in aquaria; presumed egg-scatterer。Difficult to distinguish。