赤潮是由于日益严重的海洋污染与遇上适宜的温度、风向、光照等条件(外因),使海水中一些单细胞浮游植物藻类迅速急剧地繁殖起来。近些年赤潮的发生日益频繁,分布地域越来越广,几乎世界各大洋都有发生,而且发生的时间也越来越长。赤潮对养虾业的危害是很大的。第一,由于藻类暴发性繁殖,消耗掉海水中的溶解氧,所以赤潮发生后期,引起海水缺氧,使虾窒息死亡。第二,藻类分泌一种 Red tide is due to the increasingly serious marine pollution and encounter the appropriate conditions of temperature, wind direction, light (external), so that some single-celled phytoplankton algae rapid rapid breeding. In recent years, the occurrence of red tide is more and more frequent, the distribution area is getting wider and wider, almost all the world oceans have occurred, and the time of occurrence is also getting longer and longer. Red tide harm to the shrimp industry is great. First, as algal blooms and consumes dissolved oxygen in seawater, the late red tide causes seawater to become anoxic and kill asphyxiated shrimp. Second, the algae secrete one kind