西北太平洋公海秋刀鱼渔场浮游动物数量分布的初步研究

Distribution of Zooplankton in Pacific Saury (Cololabis saira) Fishing Ground in the North Pacific Ocean

根据2005年7—10月在北太平洋E150°-158°56’、N42°34’-46°25’进行秋刀鱼资源探捕所获得的15个站点浮游动物样本资料，测得甲壳纲的桡足类、端足类、糠虾类、磷虾类，毛颚类、腔肠动物以及被囊动物等的代表种。其中桡足类占绝对优势，隶属于1目4科5属8种。浮游动物生物量4—699mg／m^3，均值168．6mg／m^3。根据浮游动物的种类、分布状况及优势种类的强弱，判断和分析黑潮暖流的强弱趋势，对确定秋刀鱼渔场的南北位置具有重要参考价值。

Zooplankton swimming with water currents includes protozoa, small crustaceans, jellyfish and worms. Zooplankton feed on phytoplankton, making them the second link in the marine food chain, and then were fed by krill, fish and large crustaceans. The investigation of Pacific saury （ Cololabis saira） resources was carried out in North Pacific Ocean （E150°-158°56＇、N42°34＇-46°25＇） from July to October,2005. Based on the analysis and identification of zooplankton samples, the representative species of Copepoda, Amphipoda, Mysidacea, Euphausiacea of Crustacea, Chaetognatha, Coelentera and Tunicata in the zooplankton samples were found at 15 sites. Copepoda were dominant in a member of one order, four families, five genera and eight species. The quantitative range of zooplankton was 4 -699 mg/m^3 with an average value of 168.6 mg/m^3. Judging and analyzing the strong and weak trend of Kuroshio current has significant roles in determining the north and south location of Pacific saury fishing ground based on species, distribution status, and dominant species of zooplankton.