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首页> 外文会议>North Pacific Anadromous Fish Commission bulletin >Similarity of Diurnal Rhythms of Pacific Salmon Feeding in the Western Bering Sea
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Similarity of Diurnal Rhythms of Pacific Salmon Feeding in the Western Bering Sea

机译：白令海西部太平洋鲑鱼摄食的昼夜节律的相似性

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摘要

Research on diurnal rhythms of salmon feeding is important for calculations of daily diets and evaluation of food sufficiency. The acquisition of such information requires datasets from trawling conducted during both day and night. The TINRO-Centre survey by RV TINRO in the western Bering Sea during the autumn of 2004 allowed for such data acquisition. Based on data averaged for several biostatistical areas, it was shown that small immature individuals (< 30 cm in fork length) of five Pacific salmon species had similar diurnal feeding patterns. They fed most intensively between 11:00 a.m. and dusk. Food was digested relatively quickly, and stomachs were essentially empty by 6:00 to 7:00 a.m. Older immature and maturing individuals had diurnal patterns that are less clear. This is probably related to food composition, and weak relationships between forage activity, time of day, and the time required to digest larger food items. If the degree of digestion is well defined, it is possible to define diurnal feeding patterns in some cases. When Hyperiidae are the primary food item, it is not possible to define the time of food intake precisely, because their chitinous shells hamper quick digestion.
机译：研究鲑鱼摄食的昼夜节律对于计算日常饮食和评估食物的充足性很重要。此类信息的获取需要白天和黑夜进行拖网作业的数据集。 RV TINRO在2004年秋季在白令海西部进行的TINRO中心调查允许进行此类数据采集。根据几个生物统计学地区的平均数据，结果表明，五个太平洋鲑鱼的未成熟个体（叉长<30 cm）具有相似的昼夜摄食模式。他们在上午11:00和黄昏之间最密集地进食。食物的消化速度相对较快，到凌晨6:00至7:00时，胃基本上已空了。未成熟和成熟的老年人的昼夜规律不太清楚。这可能与食物成分，饲料活动，一天中的时间以及消化较大食物所需的时间之间的弱关系有关。如果很好地确定了消化程度，则在某些情况下可以定义昼夜饲喂方式。当金龟科是主要食物时，由于它们的几丁质壳阻碍了快速消化，因此无法精确定义食物的摄入时间。

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