Devario laoensis (Myer's danio) is a small fish that inhabits edges of slow-medium flowing freshwater streams along the Mekong river and branches of it in Laos (Chiang Rai), Phayao, and Chiangmai.It eats small insects that land on the water surface, and grows to adult size of 5-6 cm.In Thailand, this fish is known as Danio Mae Lao (Siamensis, 2011).