Daily rhythm and seasonal variation of feeding habit of Pacific saury (Cololabis saira) in relation to their migration and oceanographic conditions off Japan
Daily rhythm and seasonal variation of feeding habit of Pacific saury (Cololabis saira) in relation to their migration and oceanographic conditions off Japan
复制标题
秋刀鱼 (Cololabis saira) 摄食习性的每日节律和季节变化与其迁徙和日本近海海洋条件的关系
DOI：
10.1111/j.1365-2419.2004.00310.x
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发表时间：
2004
影响因子：
2.6
通讯作者：
Y. Kurita
中科院分区：
文献类型：
--
作者：
H. Sugisaki;Y. Kurita
研究了太平洋秋刀鱼(Cololabis Saira)在邻近日本的北太平洋水域的周年迁徙周期后摄食活动的季节和昼夜变化与海洋条件，特别是周围水域采集的浮游动物的丰度和组成的关系。在所有季节的24小时周期中，黄昏期间经常观察到肠道饱满度高和肠道内容物消化程度低的现象。春、夏季秋刀鱼分布在黑潮-Oyashio过渡区和Oyashio(冷流)区，主要捕食太平洋真甲鱼，其肠道饱满度高于其他季节。它们的摄食活动在秋季减少，在冬季产卵季节增加，尽管它们分布在黑潮暖流区食物条件较差的地区。它们在黑潮-Oyashio过渡区和Oyashio地区的分布允许利用成体的Euphausiides，E.pacillia，这是一种重要的食物来源。
Seasonal and diel variation of feeding activities of Pacific saury (Cololabis saira) were examined following their annual migration cycle in North Pacific waters adjacent to Japan in relation to oceanographic conditions, especially abundance and composition of zooplankton collected in surrounding waters. A high gut fullness and low degree of digestion of the gut contents were frequently observed during the dusk period during the 24-h cycle for all seasons. In spring and summer saury were distributed in the Kuroshio–Oyashio transitional region and the Oyashio (cold current) area, where they mainly fed on the euphausiid, Euphausia pacifica, and had a higher gut fullness than the other seasons. Their feeding activity decreased in fall, and increased in winter, the spawning season, although they were distributed in an area of poor food conditions in the Kuroshio warm current area. Their distribution in the Kuroshio–Oyashio transitional region and the Oyashio area allow utilization of adult euphausiids, E. pacifica which is a significant food source.