Circadian rhythms and individual variability of self‐feeding activity in groups of rainbow trout Oncorhynchus mykiss (Walbaum)
Circadian rhythms and individual variability of self‐feeding activity in groups of rainbow trout Oncorhynchus mykiss (Walbaum)
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DOI：
10.1046/j.1365-2109.2002.00734.x
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发表时间：
2002-06
影响因子：
2
通讯作者：
Wei-min Chen;M. Naruse;M. Tabata
中科院分区：
文献类型：
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作者：
Wei-min Chen;M. Naruse;M. Tabata
本试验旨在研究虹鳟（Oncorhynchus mykiss（Walbaum））群体中是否存在昼夜自食节律，并探讨自食的个体差异及其对生长的影响。将10条144.9 +/- 12.0 g（平均值+/- SD）的鳟鱼转移至8个290 L罐中的每一个中，并通过自喂食器自由进食。八组中的四组鱼被单独标记，并使用视频观察识别激活触发器的个体。在16.5：7.5 h的光：暗循环和连续光照（LL）条件下记录各组的自食活动。虽然没有自我喂养的节奏组鳟鱼，在一般情况下，白天，夜间进食活动观察到在初始LD阶段，但有一个渐进的减少，并最终停止在大多数群体。内源性昼夜自食节律检测组鳟鱼在LL条件下。鳟鱼形成的优势层次的自我喂养活动，一个或两个人占大多数的触发致动。然而，支配者并没有占据扳机周围的区域。生长率没有显着差异的优势和下属之间的群体。
An experiment was conducted to examine whether circadian self-feeding rhythms exist in groups of rainbow trout Oncorhynchus mykiss (Walbaum) and to investigate individual variability of sell-feeding and its influence on growth. Ten trout of 144.9 +/- 12.0 g (mean +/- SD) were transferred to each of eight 290-L tanks and given free access to feed via a self-feeder. Fish in four of the eight groups were individually tagged, and the individual activating the trigger was identified using video observations. The self-feeding activity of each group was recorded under a light:dark cycle of 16.5:7.5 h and under continuous light (LL) conditions. Although did self-feeding rhythms in the groups of trout were, in general, diurnal, night-feeding activity was observed in the initial LD phase, but there was a progressive reduction and eventual cessation in most groups. Endogenous circadian self-feeding rhythms were detected in the groups of trout under LL conditions. The trout formed dominance hierarchies of self-feeding activity, with one or two individuals accounting for the majority of trigger actuations. However, the dominants did not occupy the area surrounding the trigger. Growth rates did not differ significantly between the dominants and the subordinates within the groups.