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Distribution of zooplankton was studied based on the zooplankton samples from collected 15 stations in Deukryang Bay in July and September, 1992 and January and March, 1993. Zooplankton biomass $(mg/m^3)$ showed maximum in March and minimum in July, whereas abundance $(inds./m^3)$

Distribution of zooplankton was studied based on the zooplankton samples from collected 15 stations in Deukryang Bay in July and September, 1992 and January and March, 1993. Zooplankton biomass $(mg/m^3)$ showed maximum in March and minimum in July, whereas abundance $(inds./m^3)$. showed maximum in September and minimum in March. Variation in biomass depended on changes in body size of Sagitta crassa. S. crassa of large body size resulted in high biomass in March. Noctiluca scintillans and copepods in September showed high abundance but low biomass. Species composition and abundance were closely related to seasonal variation of water temperature. Of the dominant zooplankton taxa, decapod larvae were predominant in July, copepods in September and January, and coelenterates 3n March. Three copepod species, Paracalanus indicus, Acartia pacifica and Pseudodiaptomus marinus were dominant in July and March, September, and January, respectively.

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