Aquarium and ornamental fish trade is currently recognized as a major source of invasive species in aquatic ecosystems around the world. The swordtail Xyphophorus hellerii is a popular ornamental freshwater fish that occurs as an introduced species in the aquatic habitats of at least thirty‐one countries. We report the first finding of an established population of the swordtail in Morocco. Twelve individuals of X. hellerii were captured along Oued Ain Chkef inside the park (Fez Province), including females and males (mature and immature). Ongoing investigations could soon reveal more occurrences of this species in the country.

中文翻译：

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在摩洛哥野外建立的剑尾鱼Xiphophorus hellerii Heckel，1848年的第一记录（Poeciliidae，Actinopterygii）

目前，水族馆和观赏鱼贸易是世界范围内水生生态系统中入侵物种的主要来源。剑尾草Xyphophorus hellerii是一种流行的观赏淡水鱼，至少在三十一个国家的水生栖息地中作为引进种出现。我们报告了在摩洛哥建立的剑尾种群的首次发现。沿公园（非斯省）内的Oued Ain Chkef捕获了十二只X. hellerii个体，其中包括雌性和雄性（成熟和未成熟）。正在进行的调查可能很快就会发现该物种在该国的更多发生。