水蜈蚣,又名水夹子,是龙虱的幼虫。是一种水生昆虫,成虫和幼虫都是肉食性的,故对鱼苗危害很大。水蜈蚣,虫体长园柱形,有一对钳形大颚,似蜈蚣毒螯得名,头部略圆,两侧具有黑色单眼6个,有趋光性,触角4节,躯干11节,前三节为胸节,各具足一对,后八节为腹节,最后2节两侧有毛,末端尾毛二条,作呼吸用,倒悬露出水面。成虫产卵于水草上,尤其是杏菜(俗称 Water centipede, also known as water clip, is a larva of the dragonfly. Is a kind of aquatic insects, adults and larvae are carnivorous, it is very harmful to fry. Water centipede, pest body long column, a pair of pincer jaw, named after the centipede toxin, slightly rounded head, with black monocular on both sides of 6, with phototaxis, tentacles 4, trunk 11, the first three For the chest, each with a pair, the latter eight sections of the abdominal section, the last two sections have hair on both sides, the end of the tail hair two, for breathing, hanging down out of the water. Adult spawning on plants, especially apricot (commonly known as