Characteristics of red tide in the Bohai Bay

Analysis of the scale of change, the causative species, spatial distribution, and temporal characteristics of the Bohai Bay red tides during the period of 42 a from 1977 to 2018 showed that most of the red tides in the Bohai Bay were small-scale with area of less than 1000 km². The main species that caused the red tides were Noctiluca sintillans, Skeletonema costatum, Ceratium furca, Phaeocystis globosa, kareniamiki motoi and Mesosinolum rubrum. The red tides primarily happened between August and September in the northwest coastal area of the Bohai Bay.