汉江上游太白河川陕哲罗鲑(Hucho bleekery Kimura)再发现

川陕哲罗鲑(Hucho bleekeri Kimura)是我国长江流域特有鱼类,近几十年来资源量急剧下降,陕西和四川等地历史分布区已多年未见其踪迹,濒临灭绝。2013年在汉江上游陕西省太白县太白河发现了19尾成体样本。本次发现是该物种在太白河消失15年后的再次发现,也是近30多年来该物种在分布区范围内同时被发现成体数量最大的一次。本次发现对川陕哲罗鲑资源保护和恢复有重要意义。

The Rediscovery of Hucho bleekeri Kimura in the Taibai River, the Upper Tributary of the Hanjiang River, China

As an endemic fish species to the Yangtze River drainage in China, Sichuan taimen (Hucho bleekeri Kimura) were historically distributed in the upper reaches of the Minjiang River in western Sichuan and in the Xushui and Taibai rivers, two tributaries in the upper reaches of the Hanjiang River at the southern foot of the Qinling mountain range. Since the 1960s, the distribution range of the species has dwindled and the population size has decreased rapidly and few records of the species were documented from 1990s. In this study, 19 adult Sichuan taimen were captured in September 2012 in the Taibai River, one of the upper tributary of the Hanjiang River. Detail morphological characteristics comparison of the four specimens in the rediscovered group from those specimen that have been documented in Dadu River, upper Minjiang River and Qingyijiang River have proofed to be the true species. It is not only the rediscovery of the species in the Taibai River during the past 15 years, but also the largest groups of Hucho bleekeri documented in the nearly past 30 years in the whole country. The rediscovery will contribute for the future population enhancement and recovery of this endangered species.