Abstract

The Nui Chua National Park is one of the National Parks which has many high mountains beside East see in Vietnam. There are many small streams in the Nui Chua National Park which directly flow in East see without river. So their animals and plants are very diversities. Butis gymnopomus, a new freshwater fish species is recorded in Vietnam is an example for their diversity: The Butis genus has a species is described in Vietnamese documents is Butis butis, before. The Butis gymnopomus has characteristics differences with Butis butis: - D1 = VI, D2 = 9; P = 18; V = 6; C = 19; A = 1, 7-8 - There is a big black line sagittal following their body (start predorsal fin to origin caudal fin). - The cadal fin which equally soft rays. The first three rays are white color. The white color are decreased from the forth to nineth's. And the tenth to final are black color. - This species are described in Malaysia, Borneo, Celebes, Kabaena, New Guinea and Philippines.