Zhelin Bay is one of the most important bays for marine culture in Guangdong Province of China. Due to the increasing human population and marine culture in the last 10 years, the environment has changed dramatically. Although Phaeocystis blooms had brought tremendous economic loss and ecological damage to this area in 1997 and 1999, few studies followed and there are no previous investigations of phytoplankton. To understand why Phaeocystis blooms frequently hit this area and how the increased marine cultu...