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剑尾鱼 (Swordtail) - Xiphophorus helleri
剑尾鱼（Xiphophorus helleri）凭借其极强的生命力和对多种水质的适应能力，它们不仅是育种家手中的常客，衍生出了多种人工改良色系，更是新手起步的不二之选。这种活泼且性格温和的鱼类非常适合与其他小型温顺品种混养。
- 拉丁学名：Xiphophorus helleri
- 分类学：辐鳍鱼纲 Actinopterygii → 鳉形目 Cyprinodontiformes → 花鳉科 Poeciliidae → 剑尾鱼属 Xiphophorus