High oxygen consumption rates and scale loss indicate elevated aggressive behaviour at low rearing density, while elevated brain serotonergic activity suggests chronic stress at high rearing densities in farmed rainbow trout
High oxygen consumption rates and scale loss indicate elevated aggressive behaviour at low rearing density, while elevated brain serotonergic activity suggests chronic stress at high rearing densities in farmed rainbow trout
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DOI：
10.1016/j.physbeh.2013.08.026
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发表时间：
2013-10
影响因子：
2.9
通讯作者：
D. C. Laursen;Patricia I. M. Silva;B. Larsen;E. Höglund
中科院分区：
文献类型：
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作者：
D. C. Laursen;Patricia I. M. Silva;B. Larsen;E. Höglund
放养密度对福利指标的影响已经通过对养殖虹鳟鱼的几项研究进行了研究。然而，福利受到损害的密度仍然不明确。在这里，三种不同的放养密度处理选择的基础上，以前的研究，拥挤的水平，确定使用的空间分布的鱼在两个水箱系统的结果。研究了25 kg m− 3的非拥挤低密度、80 kg m− 3的鱼在没有显示拥挤压力的情况下接受的最高密度作为中等密度，以及140 kg m− 3的鱼在显示拥挤压力的情况下接受的最高密度作为高密度。本研究的目的是检查被关押在这些密度的福利指标的影响。这是通过使用自动呼吸测定法测量耗氧量、记录鳍侵蚀、确定鳞片损失和分析血浆皮质醇和脑皮质激素活性水平来实现的。在本研究中获得的结果表明，在最低密度的鱼有空间和机会显示其自然的攻击行为，并在最高密度的鱼被暴露在一个封闭的情况。
The effect of stocking density on indicators of welfare has been investigated by several studies on farmed rainbow troutOncorhynchus mykiss. However, the densities at which welfare are compromised remain ambiguous. Here three different stocking density treatments were selected based on the results of a previous study, where levels of crowding where determined using the spatial distribution of fish in two-tank systems. An un-crowded low density of 25 kg m− 3, the highest density accepted by the fish without showing indications of crowding stress of 80 kg m− 3as the intermediate density, and the highest density accepted by the fish showing indications of crowding stress of 140 kg m− 3as the high density were investigated. The aim of the present study was to examine the effect of being held at these densities on indicators of welfare. This was achieved through oxygen consumption measurements using automated respirometry, recording fin erosion, determining scale loss and analysing plasma cortisol and brain serotonergic activity levels. The results obtained in the present study indicated that at the lowest density the fish had the space and opportunity to display their natural aggressive behaviour and that the fish held at the highest density were exposed to a situation of confinement.