Botia udomritthiruji (emperor loach) is a small freshwater fish in the loach family Botiidae native to the Great Tenasserim (Tanintharyi) River Basin in south Burma.

It was named after Thai aquarist and fish exporter Kamphol Udomritthiruj.

Emperor loaches are peaceful fish suitable to community aquarium tanks.

However, they are difficult to obtain because of the inaccessibility of the areas where they live, that is in the Tenasserim range forests where there are almost no roads and most trails are infested by leeches.

[6] Unfortunately the area where they live is subject to heavy deforestation owing to illegal logging operations.