Potential grain output and technology approaches in the plain around the Bohai Sea in Shandong Province Preliminary Comparative Researches on the Species Composition of Freeliving Marine Nematodes in Different Occasions in the Bohai Sea The netz-phytoplankton community of the central Bohai Sea and its adjacent waters in autumn, 1998 The chlorophyll a concentration and estimating of primary productivity in the Bohai Sea in 1998~1999 Distribution of Synechococcus in the Bohai Sea in Autumn and Spring