Nutrient composition changes in coastal waters of Tangshan Bay, Hebei, China under anthropogenic influence. THE PHOTOSYNTHESIS AND PRODUCTIVITY OF BENTHIC MACROPHYTES IN SANGGOU BAY Estimation and experiment of carbon sequestration by oysters attached to the enhancement artificial reefs in Laizhou Bay, Shandong, China. Biological characteristics, temporalspatial distribution of Portunus trituberculatus and relationships between its density and impact factors in Laizhou Bay, Bohai Sea, China. THE ORGANIC CARBON OF PHYTOPLANKTON IN MEIZHOU BAY IN THE SUMMER THE CYCLE OF CARBON IN DAYA BAY