科: Cyprinidae
细长白甲鱼为鲤科鱼类，温和，宜与体型相近的和平鱼混养，原生分布于中国南方山溪河流。性情平和、食性杂，是混养缸里最省心的居民之一。成体约 23.7–34.8 cm，4–6 尾可观察自然行为，适宜水温 18–26 °C。稳水、换水、杂食，足矣。
A Cyprinidae species native to southern Chinese mountain streams: Onychostoma elongatum lives active throughout the water column over gravel. Peaceful; keep with similar-sized calm tankmates. Adults reach 23.7–34.8 cm. It is one of the aquarium-kept Onychostoma species we profile, alongside Onychostoma barbatulum, Onychostoma angustistomata, Onychostoma gerlachi.
适合有一定经验的玩家。Peaceful; keep with similar-sized calm tankmates；Keep in a group of 4–6 for natural behaviour。
保持 18–26 °C 并避免波动，pH 6.5–7.5、GH 5–15 dGH 即可。
成体 23.7–34.8 cm 左右，因其Active throughout the water column的习性，500 L 以上的缸更合适。
Omnivore; prepared foods with regular variety。每天两小餐比一顿大餐更利于状态。
Peaceful; keep with similar-sized calm tankmates；Keep in a group of 4–6 for natural behaviour。理想混养对象：Robust schooling cyprinids — Add activity without conflict。需避开Much larger predators — Risk at night。
原生于中国南方山溪河流，栖息于Clear streams and rivers over gravel。Moderate, well-oxygenated current，Appreciates well-oxygenated water。
跳缸风险低，但加缸盖更稳妥。
人工环境下：Breeding is straightforward scatter-spawning。Males often slimmer and more colourful。