通过光学显微镜和电镜研究了食蚊鱼的性腺发育，并观察了它的性周期．结果表明：食蚊鱼属卵胎生鱼类，其精、卵结构不同于卵生鱼类，表现在精子头部细长，尾部中段有发达的线粒体鞘，卵子的卵膜极薄，其内含有丰富的脂滴和卵黄等特征．食蚊鱼每年５～１０月为繁殖盛期，繁殖周期为２０～３０ｄ． The gonadal development of mosquitoes was studied by light microscopy and electron microscopy, and its sexual cycle was observed. The results showed that the mosquito fish belonged to the ovum and its essence and egg structure was different from that of the oyster fish. It showed sperm head slender and the middle of the tail had the developed mitochondrial sheath. The ovum had very thin egg membrane, Lipid droplets and egg yolk and other characteristics. Mosquito fish from May to October each year for the breeding season, the breeding cycle of 20 ~ 30d.