中文摘要：

根据1997-2000年东海（23°30’～33°00’N，118°30’～128°00E）海域四季海洋调查资料，探讨了东海浮游介形类分布特征及与环境的关系．结果表明：东海浮游介形类丰度占浮游动物总丰度的3．47％；春、夏、秋和冬四季平均丰度分别为0．70，1.72，2．57和0．90个／m^3；冬春季的短棒真浮萤（Euconchoecia chierchiae），夏季的后圆真浮萤（Euconchoecia maimai）和秋季的齿形海萤（Cypridina dentata）分别是各季的主要优势种；夏、秋季介形类总丰度与水文环境因子的线性相关性不显著，春季与表层盐度相关，冬季与表层温度相关．东海北部外海四季均有介形类高丰度区出现，但在东海北部近海长江口及其邻近舟山水域，介形类数量相对较低．在东海南部，冬春季高丰度区位于外海，夏秋季在近海．东海浮游介形类基本上是一大类较为典型的暖水性且具有集群行为的海洋浮游动物．介形类秋季高丰度区和较高丰度区的分布与太平洋褶柔鱼（Todarodes pacificus）、绿鳍马面鲀（Navodon SPptentrionalis）、鲐鯵鱼类等渔场的位置基本一致，在渔业上有重要的意义．

英文摘要：

On the basis of the data of four seasonal investigations in the East China Sea （23°30＇-33°00＇N, 118°30＇-128°00＇E） from 1997 to 2000, the distribution and the seasonal changes of Ostracods abundance and the relationship between its abundance dynamics and environment and fishing ground were discussed in this paper through qualitative and quantitative methods. Results showed that the average abundance （2. 57 ind/m^3） of Ostracods peaked in autumn, which was equal to 41.59% of total abundance in four seasons. It was the second highest value （1.72 ind/m3） in summer, equaled to 36. 55% of the total abundance. 0.90 ind/m^3 in winter and 0.70 ind/m^3 in spring, which was the lowest value in four seasons. The dominant species of Ostracods separately were Euconchoecia chierchiae Muller in spring and winter, Euconchoecia maimai Tseng in summer and Cypridina dentata （Muller） in autumn. Moreover, it was found that the total abundance showed linear correlation with surface salinity in spring and with surface water temperature in winter, while the abundance in summer and autumn did not show significant correlation with hydrographic environmental factors. Ostracods, whose abundance was equal to 3.47% in the total zooplankton, only being lower Copepods and Decapods in pelagic Crustacean, was an important pelagic animal. High abundance area of Ostracods was located in north offshore of the East China Sea for four seasons while low abundance area occurred in nearshore of Zhoushan fishing ground. In south of the East China Sea, high abundance area of Ostracods was located in offshore in winter and spring but nearshore in summer and autumn. These suggested that Ostracods was a kind of typical warm water zooplankton whose abundance was related to high water temperature seasons or warm water current. The aggregated behavior of Ostracods was dependent on the influence of its dominant species. It was also found that Ostracods, whose high abundance area of very nearly overlapped the grazing areas of Todarodes p