, an endemic species in China, has been threatened by overfishing, and biological invasion, among other factors. A total of 1126 individuals were collected between August 2008 and August 2009 from Lhaze to Nyemo on the Yarlung Zangbo River, Tibet. The population resources and fishery conversation policies of the fish were studied using per-recruit models. The total instantaneous annual mortality ( was 0.11/a for females and 0.16/afor males. The ranges of natural mortality () for females and males were 0.08/a-0.09/aand 0.10/a-0.12/a, respectively. The range of the current fishing mortality () was 0.02/a-0.03/a for females and 0.04/a-0.06/afor males. The range of the spawning potential ratio of was 61.7%-73.1% for females and 48.5%-63.3% for males, both of which were significantly higher than the target reference point (40%). This indicates that the stock of could be reasonably exploited under the current fishery conversation policy, but special attention should be paid to the stock of in case of over-exploitation in the long-term. To evaluate the protective effects of capture age and seasonal closure, 14 different fishery conversation policies were simulated. The results suggest that the stock of could be effectively conserved by enhancing the capture age to 17 years or above and allocating seasonal closure from at least February to May.