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, is native to southern Chinese mountain streams. Its sucker belly is made for mountain rapids — still, warm water suffocates it faster than any disease. It lives on the bottom. Adults reach 4.5–6.6 cm. Loosely social; crowding causes endless pushing. Provide strong flow, cool temperatures and mature algae-covered rockwork; keep it below 26 °C. Maintain 18–26 °C at pH 6.5–7.5. Water quality and diet matter more than décor.