科: Salmonidae
马苏大马哈鱼（山女鳟）为鲑科鱼类，对同类有领地性，捕食小鱼，原生分布于日本。成体约 15–30 cm，独居或小群，幼鱼群游，适宜水温 8–18 °C。
Oncorhynchus masou is a Salmonidae from Japan. In the wild it prefers cold, highly oxygenated mountain streams; in the aquarium it stays territorial toward its own kind. Plan on 15–30 cm of adult fish at 8–18 °C. Related profiles: Oncorhynchus masou ishikawae.
饲养难度：中等。Territorial toward its own kind; predatory on small fish。
建议水温 8–18 °C，8–18 °C curated husbandry range；Chiller or cold-water management in summer。
成体 15–30 cm 左右，因其Bottom to mid-water in runs and pools的习性，300 L 以上的缸更合适。
Carnivore; insects, crustaceans and small fish。建议人工饲料搭配冷冻或活饵，保证多样性。
可以。Territorial toward its own kind; predatory on small fish，适合与Similar-sized peaceful community fish — Similar size and water needs混养。避开Much smaller fish — May outcompete or bully tiny tankmates。
原生于日本，栖息于Cold, highly oxygenated mountain streams。Strong current over gravel，Requires near-saturated dissolved oxygen。
确认会跳：请使用密闭缸盖，并适当降低水位。
Autumn redd spawner in flowing gravel。Males develop kype and brighter colours at spawning。