雅砻江河口区产漂流性卵鱼类早期资源现状

为了解雅砻江河口区产漂流性卵鱼类的早期资源现状,2016-2018年6-7月在攀枝花市盐边县雅砻江河口开展了鱼类早期资源调查工作。共采集产漂流性卵鱼类5种,分属1目2科,其中长江上游特有鱼类3种,分别为长薄鳅(Leptobotia elongata)、中华金沙鳅(Jinshaia sinensis)和短身金沙鳅(Jinshaia abbreviata);2016-2018年流经雅砻江河口断面的鱼卵径流量分别为3.5×10^6、13.78×10^6和3.87×10^6ind;调查期间累计出现8次产卵高峰(2016和2018年各2次,2017年4次),鱼类的繁殖盛期在6月中下旬;通过推算,攀枝花盐边县和攀枝花米易县得石镇是河口区产漂流性卵鱼类的主要产卵场。

Status of early fish resources of drifting egg fishes in the estuary of the Yalong River.

To understand the status of early resources of drifting egg fishes,we carried out surveys on the fishes at early life history stage in the Yalong River estuary located in Yanbian County from June to July in 2016-2018.The results showed that five species of drifting egg fishes were identified,belonging to two families and one order.Three endemic fishes of the upper Yangtze River were identified among the five species,namely Leptobotia elongata,Jinshaia sinensis and Jinshaia abbreviata.The abundance of fish eggs flowed through the Yalong River estuary was3.5×10^6,13.78×10^6 and 3.87×10^6 ind from 2016 to 2018,respectively.There were eight spawning peaks during surveys(2,4,and 2 times in 2016,2017 and 2018 respectively).The main spawning period of fishes was in the middle and late June.It was estimated that Yanbian County and Deshi Town of Miyi County in Panzhihua were the main spawning grounds for drifting eggs in the Yalong River estuary.