千河流域秦岭细鳞鲑资源调查报告

Resource survey report of Brachymystax lenok tsinlingensi in Qianhe river valleys of Qinling mountains

秦岭细鳞鲑(Brachymystax lenok tsinlingensis)属典型的陆封性冷水鱼类,国家Ⅱ级重点保 护水生野生动物,是细鳞鲑属(Brachymystax)所有物种中分布最南端的1个亚种,秦岭山脉北麓的 千河流域内目前数量较多.通过实地调查表明,千河流域内分布的秦岭细鳞鲑种群发生了3个明显 的变化:(1)分布最低高度由原来海拔1 000 m上移至1 200 m,分布范围缩小;(2)个体小型化; (3)种群数量减少.文中还就秦岭细鳞鲑的保护对策提出了建议.

The thin scale's salmon of Qinling Mountains (Brachymystax lenok tsinlingensis) belongs to a typical type of cold water fish of nature that seals land, and is the Ⅱ grade of focused protection aquatic wild animal of China. Belonging to a southermost subspecies, the thin scale's salmon of Qinling Mountains owns a large quantity at present in the Qianhe river valleys, northhill of Qingling mountains. On-site inspection result shows the thin scale's salmon in the river valleys have three changes taken place as follows: (1) The lowest altitude has changed from 1 000 m to 1 200 m, and the distribution range dwindled. (2) Individual miniaturized, (3) The quantity of stock reduced. Further more, in this article, the author give out propositions about the protection of this species.