On April 3rd, in Nanchang, southern China, the fish in QingShan Lake appeared restless. Videos captured by eyewitnesses show fish continuously leaping out of the water in a certain area of the lake.

According to a staff member from the Lake Management Department of the QingShan Lake Scenic Area, this phenomenon is not uncommon and is considered normal. Fish jumping out of the water mainly occurs due to two reasons: the introduction of fresh water and continuous heavy rainfall.

He explained that in the video, there is a black pipeline on the left side of the lake, which brings fresh water from the northern branch of the Yubai River into QingShan Lake. As long as there is inflow of fresh water, enhancing the water's flow and oxygen content, the fish tend to swim against the current, gather in the direction of the water flow, and when the fish density increases, they leap out of the water. "In addition, with the continuous heavy rainfall during this period, the water becomes depleted of oxygen, causing the fish to surface. In previous years, during this season and in thunderstorm weather, fish groups have exhibited similar behavior," the staff member stated.

The video was provided with permission from local media.

4月3日，江西南昌，青山湖的鱼群出现躁动不安。目击市民拍摄的视频显示，湖泊上一片区域内，不停地有鱼跃出水面。
对此，青山湖风景区湖泊管理科的一位工作人员介绍，该情况并不罕见，是正常现象。鱼跳出水面主要有两个原因，一是活水引入，二是连日的暴雨。
他解释，从视频中可以看到湖泊左侧有一个黑色的管道，它将玉带河北支的活化水引入青山湖。只要一抽排活水、有水流引入，湖水的流动性就会增强、水体氧气充足，鱼群便会逆流而上，向水流方向聚集，鱼一多、密度大，就会纷纷跳出水面。“再加上这段时间连续降暴雨，水体缺氧，鱼就会冒头。往年每到这个季节、出现雷雨天气，鱼群也都会这样。”上述工作人员说。
据统计，江西自3月23日进入强对流多发季节，短短十天时间，已出现4次强对流天气过程。