1987年8月上旬,浙江省嵊泗县构杞海区发生大面积赤潮,海水比重降至1.015,水色呈红褐色,镜检中发现有大量夜光虫、甲藻相赤潮生物,造成海湾扇贝大量死亡。未分笼养殖的稚贝死亡率高达70%以上,养殖的大、小鲍鱼全部中毒死亡,岩礁上的部分贻贝也发生死亡.从 In early August 1987, a large area of ​​red tide occurred in the Qiqihai sea area of ​​Shengsi County, Zhejiang Province. The proportion of seawater dropped to 1.015 and the aqua color was reddish brown. A large amount of noctiluca and dinoflagellate red tide organisms were found in the microscopic examination, resulting in a large number of bay scallops’ death. Juveniles without cage farms mortality rate as high as 70%, all of the breeding of large and small abalone poisoning death, part of the mussels on the rock also died.