Changes in demand feeding behaviour in Arctic charr, Salvelinus alpinus L., caused by differences in dietary energy content and reward level
Changes in demand feeding behaviour in Arctic charr, Salvelinus alpinus L., caused by differences in dietary energy content and reward level
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DOI：
10.1111/j.1365-2109.1996.tb01277.x
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发表时间：
1996-01-01
影响因子：
2
通讯作者：
Kiessling, A.
中科院分区：
文献类型：
--
作者：
Alanara, A.;Kiessling, A.
本研究的目的是确定北极红点鲑（Salvelinus alpinus L.）能够根据饮食能量含量（实验1）和奖励水平（响应于一次触发动作而接收的食物量）（实验2）的差异来调整它们的需求进食行为。鱼（实验1中的初始大小为215 g，实验2中的初始大小为88 g）在0.8-m-3室内池中以商业放养密度饲养，并使用按需饲养器饲养57和180天，分别需求喂养活动没有显着差异组之间的木炭喂养的饮食，低（19.8兆焦耳kg-1）的总能量含量和那些给予高能量（22.0兆焦耳kg-1）饲料。结果，提供高能量饮食的鱼类生长得更快。结果表明，在培养条件下举行的charr是无法调整其需求的基础上的食物的能量含量的摄食活动。相反，北极红点鲑能够调整其需求摄食活动，以低（0.33克），中（0.87克）或高（1.52克）的奖励，从而调节其食物供应，以满足其需求。然而，大约90天后，低奖励组的夏尔才释放出与高奖励组一样高的每日食物配给量。因此，奖励的大小和最终权重之间存在显著的正相关关系。为了避免任何抑郁症的初始增长率，奖励的最佳大小应该是0.1克每公斤鱼和触发驱动。
The objective of this study was to determine whether Arctic charr, Salvelinus alpinus L., are able to adjust their demand feeding behaviour in accordance to differences in dietary energy content (experiment 1) and reward level (amount of food received in response to one trigger actuation) (experiment 2). Fish (initial size 215 g in experiment 1 and 88 g in experiment 2) were reared in 0.8-m-3 indoor tanks at commercial stocking densities and fed using demand feeders for 57 and 180 days, respectively Demand feeding activity did not differ significantly between groups of charr fed diets with a low (19.8 MJ kg-1) gross energy content and those given high-energy (22.0 MJ kg-1) feed. As a result, fish offered the high-energy diets grew significantly faster. The results show that charr held under culture conditions are unable to adjust their demand feeding activity based on the energy content of the food. On the contrary, Arctic charr are able to adjust their demand feeding activity to either low (0.33 g), medium (0.87 g) or high (1.52 g) rewards, and thereby, regulate their food supply to fit their needs. However, it took about 90 days before charr in the low-reward treatment released a daily food ration as high as that released in the high-reward groups. Consequently, there was a significant positive relationship between the size of the reward and final weights. To avoid any depression of initial growth rates, the optimal size of the reward should be 0.1 g per kg fish and trigger actuation.