三峡水库支流小江鱼类早期资源现状

分别于2017年和2018年的5—7月在三峡库区支流小江渠口断面开展鱼类早期资源监测,以了解小江变动回水区鱼类早期资源现状。监测结果表明:共采集到7种产漂流性卵鱼类的鱼卵以及7种仔鱼;采集的鱼卵以似鳊(Pseudobrama simoni)、银(Squalidus argentatus)、翘嘴鲌(Culter alburnus)和蒙古鲌(Culter mongolicus)为主,而仔鱼则以子陵吻虎鱼(Rhinogobius giurinus)为主;不同年份主要产卵活动发生的时间存在差异;小江渠口镇铺溪村至汉丰湖调节坝之间江段共分布集中产卵场3处。小江变动回水区江段是产漂流性卵鱼类产卵场的分布区域,建议加强该江段生境和鱼类资源保护管理。

Status of Early Stage Fish Resources in Xiaojiang River of the Three Gorges Reservoir

To understand the status of early-stage fish resources in the backwater fluctuation zone of the Xiaojiang River,the monitoring survey was conducted in Qukou section of the Xiaojiang River,a typical tributary of the Three Gorges Reservoir,from May to July in 2017 and 2018.7 kinds of drifting fish eggs and 7 kinds of larvae were collected.The fish eggs collected were mainly comprised of those of Pseudobrama simoni,Squalidus argentatus,Culter alburnus and Culter mongolicus,while the dominate species of larvae was Rhinogobius giurinus.There were significant differences in the occurrence time of main spawning activities between 2017 and 2018.A total of 3 spawning grounds were identified in the reaches between the Puxi Village of the Qukou Town and the Hanfeng Lake regulating dam in Xiaojiang River.The backwater fluctuation area in Xiaojiang River was the spawning ground distribution area of some important fish species.Therefore,the protection of the habitat and fish resources should be strengthened in the backwater fluctuation area of Xiaojiang River.