This study examined effects of mangrove plants Kandelia obovata and Aegiceras corniculatum on harmful algal species. While A. corniculatum leaf extract had no inhibitory effect, K.
* Cell abundance peaked in autumn, while summer had the highest diversity index, indicating varying community structures across seasons.
* Key environmental factors affecting these variations included phosphate levels, salinity, temperature, silicate, and the DIN/SiO ratio, suggesting that scallop farming could lead to eutrophication and increased red tide risks.