The green tide is a kind of harmful ecological phenomenon that some large green algae(such as Ulva prolifera,U.pertusa)in the sea water are proliferating or highly aggregated in a certain environment,it is regarded as a marine disaster like the red tide.There are more than a dozen species distributed along the coast of China,and the green tide that caused the green tide disaster in the Qingdao sea area in 2008 was U.prolifera.From 2008 to 2017,the East Sea and the Yellow Sea of China have consecutively suff...