每到6—9月间,因温度高,气候变化异常,给池塘养鱼带来很大的威胁。这时期,经常发现鱼在早晨4—5点钟就开始浮头,日出九点钟之后还不下沉,导致成鱼大量窒息死亡。据介绍,产生这种现象的主要原因有两点:一是池塘养鱼过多,密度太大;二是池塘底腐殖质沉积太厚,投饵和施入未发酵的肥料过 Every 6 to 9 months, due to high temperatures, abnormal climate change, fish ponds to bring a great threat. During this period, it was often found that the fish started floating at 4-5 am and did not sink after nine o’clock at sunrise, resulting in a large number of adult choking deaths. According to reports, there are two main reasons for this phenomenon: First, too much fish ponds, density is too large; second pond bottom humus deposition is too thick, feeding and application of unfermented fertilizer