The numbers of population of Chironmidae varied with two peaks in annual fluctuation.The hatch abilities of Chironomidae were 28.97-47.57% in cohirt, with a mean of 41.6 percent.

• 摇蚊科幼虫的区系季节变化，一年中有两个高峰期，其羽化率为现存量的28.；97%25至47