麦穗鱼（Pseudorasbora parva），又名罗汉鱼，俗名浮水仔，是辐鳍鱼纲鲤形目鲤科的其中一种。

本鱼原产于中国、**、韩国、俄罗斯远东地区及日本的溪流中。引入世界各地，并造成某些地区的生态冲击。

Stone moroko (also known as topmouth gudgeon), Pseudorasbora parva, is a fish belonging to the Cyprinid family, native to Asia, but introduced and now considered an invasive species in Europe. The fish's size is rarely above 8 cm and usually 2 to 7.5 cm long.