金沙江二期工程蓄水前下游皎平渡江段产漂流性卵鱼类产卵场现状

为了解金沙江二期工程白鹤滩、乌东德水库蓄水前，金沙江下游产漂流性卵鱼类产卵场现状，2016～2018年在皎平渡江段使用弶网对产漂流性卵鱼类早期资源开展调查。结果显示:金沙江下游皎平渡江段产漂流性卵鱼类有7种，其中长江上游特有鱼类5种，分别为中华金沙鳅（Jinshaia sinensis）、长薄鳅（Leptobotia elongata）、圆口铜鱼（Coreius guichenoti）、长鳍吻鮈（Rhinogobio ventralis）和红唇薄鳅（Leptobotia rubrilabris）。2016～2018年产漂流性卵鱼类产卵量分别为2 140.0×104、2 189.9×104、2 486.2×104粒，产卵场主要分布在元谋县、永仁县、平地镇、金江镇和格里坪镇5个江段。金沙江下游皎平渡以上江段产漂流性卵鱼类产卵规模较大，但在二期工程蓄水后部分江段将成为淹没区，其产卵繁殖活动将会受到一定程度的影响。针对研究结果，建议对乌东德库尾以上干支流流水江段开展生境保护和修复。

Resources Status of Ichthyoplankton in Jiaopingdu section of the lower Jinsha River Before the Storage of Jinsha River Second Stage Project

In order to estimate the resources status before the storage of Baihetan and Wudongde hydropower project, surveys of Ichthyoplankton resources were carried out in Jiaopingdu section of the lower Jinsha River from 2016 to 2018. The results showed that there were 7 fish species with drifting eggs, five of which were endemic to the upper Yangtze River, including Jinshaia sinensis, Leptobotia elongate, Coreius guichenoti, Rhinogobio ventralis and Leptobotia rubrilabris. In 2016, 2017 and 2018, the total eggs quantity of fish with drifting eggs were 0.21×108 ind, 0.22×108 ind and 0.25×108 ind, respectively, and spawning grounds were located in Yuanmou, Yongren, Pingdi, Jinjiang and Geliping sections. Sections above the Jiaopingdu were large in scale of fish with drifting eggs, which will be inundated after the storage of Jinsha River second stage project, and then the propagation of fish maybe affected. It is suggested that the spawning habitat should been protected and restored in flowing sections of mainstream and tributary above the end of Wudongde reservoir based on the results of the research.