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Xizang (Tibet) Autonomous Region is located in Southwestern part of China. It includes the higest part of Qinghai-Xizang Plateau and its average altitute is over 4000m above sea level, so that it is called "the Third Pole on the Earth". Covering an area of 1200000 km2 , with a diversified geomorphology and complicated physical environment, the landform is of great difference and the climate varies in different regions. There are Himalaya, Gangdise, Nyainqentanglha, Kunlun and Tanggula Mountains from the south to the north; many great rivers, such as Changjiang, Lancangjiang, Nujiang, Irrawaddy, Yarlung Zangbo, Indus Rivers, etc. and some interior waters, such as Nam Co, Silling Co, Banggong Co, Yamzhon Yum Co, Maphamyum Co Lakes, etc. in Asia and on the earth rise or flow here.

According to our collections made in Xizang in last five years and other works, there are 57 species and 14 subspecies belonging to 3 orders, 5 families and 4 subfamilies, 22 genera of fresh-water fishes in Xizang are recognized. Among them are 25 species and 14 subspecies from 7 genera in known 11 genera, or 54.9% of the total, of Schizothoracinae of Cyprinidae in China; 16 species, or 22.5%, of Noemachilinae of Cobitidae; 11 species, or 15.5%, of Sisoridae. All mentioned species or subspecies constitute over 93% of the total in the ichthyofauna of Xizang. Schizothoracinea ranked in the first both number and stocks. Only 5 species belongs to other groups such as Barbinea, Labeoninea and Psilorhynchidae, and they constitute only about 7% of the total

1. Salmoniformes
(1) Salmonidae
2. Cypriniformes
(1) Cobitidae
(2) Cyprinidae
(3) Barbinae
(4) Labeoninae
(5) Schizothoracinae
(6) Psilorhynchidae
3. Siluriformes
(1) Sisoridae

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