凹吻鲆（学名：Bothus mancus，又称蒙鲆，俗名比目鱼、扁鱼、蒙鲽、残鲆、异鳞鲆）为辐鳍鱼纲鲽形目鲽亚目鲆科鲆属的一种鱼类。

本鱼分布于印度－太平洋区的热带水域，包括西达毛里求斯、马尔代夫群岛、南达大赫的岛、东达中美洲可可斯群岛、北达日本南部以及****到西沙群岛等，属于热带暖水性底层海鱼。该物种的模式产地在南太平洋塔希提或大海地岛。

The peacock flounder (Bothus mancus), also known as the flowery flounder, is a species of fish in the family Bothidae (lefteye flounders). The species is found widely in relatively shallow waters in the Indo-Pacific, also ranging into warmer parts of the east Pacific.