科: Cyprinidae
兰氏鲫为鲤科鱼类，性情平和，适合混养，原生分布于日本。性情平和、食性杂，是混养缸里最省心的居民之一。成体约 36–52.8 cm，建议小群饲养，适宜水温 18–26 °C。稳水、换水、杂食，足矣。
Carassius langsdorfii is a Cyprinidae from Japan. In the wild it prefers clear streams and rivers over gravel; in the aquarium it stays calm, undemanding and well-suited to community life. Plan on 36–52.8 cm of adult fish at 18–26 °C. Related profiles: Carassius auratus, Carassius cuvieri.
中等难度，稳定水质比高端设备更关键。Calm, undemanding and well-suited to community life，Small groups recommended。
建议水温 18–26 °C，18–26 °C typical for the family；Room temperature to heated, depending on origin。
成体 36–52.8 cm 左右，因其Active throughout the water column的习性，500 L 以上的缸更合适。
Unfussy omnivore; varied diet keeps condition。它在Fine gravel and sand上自然觅食，投喂可少量多次。
Calm, undemanding and well-suited to community life；Small groups recommended。理想混养对象：Robust schooling cyprinids — Add activity without conflict。需避开Much larger predators — Risk at night。
原生于日本，栖息于Clear streams and rivers over gravel。Moderate, well-oxygenated current，Appreciates well-oxygenated water。
换水与维护期间建议加盖，防止惊跳。
人工环境下：Spawns freely; remove parents to save the eggs。Males often slimmer and more colourful。