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Monitoring on Marine Living Resources and their environment

海洋生物资源及其环境监测

基本信息

批准号：
11205204
负责人：
TERAZAKI Makoto
金额：
$ 8.32万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

In short-lived squieds, recruitement success most likely depends on the physical and biological environments at the spawning and nursery grounds. Annual catches of Japanese common squid, Todarodes pacificus, in Japanese and Korean waters have markedly increased since the late 1980s, and recent catches have equaled those of 1960s. A previous study suggested that the winter spawning area of T. pacificus in the East China Sea shrank when adult stocks decreased during a cool regime that occurred before 1988, and that its fall winter spawning areas extended and overlapped in the Japan and East Sea when adult stocks increased during a warm regime that occurred after 1989. Inter-calibration of four different plankton nets was carried out in order to compare the sampling efficiency of each net, quantitatively. Horizontal distribution, vertical distribution and seasonal variation of zooplankton, copepods and chaetognaths in the various waters in the Japan Sea, were reported. The Feeding activity of Sagitta elegans was high during night time and they consumed similar food organisms throughout the year. High zoopalnkton biomass was recognized in May after the spring bloom of phytopalnkton at Station T off Tsugaru and there was no influence of the Tsushima warm current in this station from January to July. Transportation mechanism of fish eggs and larval fish was analyzed by using CTD casts, ADCP, remote sensing and drifting buoys observations in the East China Sea.

对于寿命较短的乌贼来说，招募成功与否很可能取决于产卵地和苗圃的物理和生物环境。自1980年代末以来，日本和朝鲜水域的日本普通鱿鱼，太平洋Todarodes pacificus的年捕获量显著增加，最近的捕获量与1960年代相当。已有研究表明，1988年以前，在成鱼种群数量减少的较冷时期，东海太平洋赤潮的冬季产卵区缩小；1989年以后，在成鱼种群数量增加的较暖时期，日本和东海的秋季冬季产卵区扩大并重叠。为了定量比较每个网的采样效率，对四种不同的浮游生物网进行了相互校准。报道了日本海各水域浮游动物、桡足类和毛纲动物的水平分布、垂直分布和季节变化。隐杆线虫的取食活性在夜间较高，全年食用相似的食物生物。津加陆外T站的植物浮游生物在春季开花后的5月生物量较高，1 - 7月没有受到对马暖流的影响。利用CTD cast、ADCP、遥感和漂流浮标观测，分析了东海海域鱼卵和幼鱼的运输机制。