Investigation of Fish Resources in Hechi Prefecture of Guangxi Province,with Comparison of Fish Biodiversity Between Two Tributaries

Field surveys were conducted in the freshwater ichthyfauna of the Liu River and the Hongshui River in the Hechi Prefecture, Guangxi Province between 1994 to 2008. According to the field surveys and reference records, the two rivers harbor a total of 185 species belonging to 9 orders, 21 families, and 107 genera. Compared with previous investigations, 21 species were newly discovered in this area, including 1 new genus and 19 new species. There is a total of 134 fish species in the Liu River, under 8 orders, 19 families, and 88 genera. The species of Cypinifomes has the highest number in popoulation. The Perciformes came in second, and the Siluriformes is the third. The numbers of species for other orders are comparatively smaller than the three orders, only 1-3 species. The total number of species in the Hongshui River is 157, belonging to 8 orders, 20 families, and 101 genera. The number of species for Cypinifomes is the most. The Siluriformes takes second place, and the Perciformes is the third. The numbers of species of other orders are comparatively smaller than the three orders. The fish diversity of Hongshui River is richer than Liu River and the reasons are that Hongshui River flows through such regions that karst and underground rivers are developed and drainage areas are broad, with plenty of water.