Effect of background color on the social stress of Nile tilapia (Oreochromis niloticus)
Effect of background color on the social stress of Nile tilapia (Oreochromis niloticus)
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DOI：
10.1590/s1516-35982004000400002
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发表时间：
2004-08-01
期刊：
影响因子：
--
通讯作者：
Ribeiro, Sandra
中科院分区：
文献类型：
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作者：
Merighe, Giovana Krempel Fonseca;Pereira-da-Silva, Elyara Maria;Ribeiro, Sandra
研究了尼罗罗非鱼幼鱼在不同背景、不同颜色和不同社会环境下的行为和生理反应。这些动物被隔离在覆盖着彩色纸卡的鱼缸里，分为五个处理组(黑色、绿色、棕色、蓝色和白色)。通过每周一次的拍摄，在不同和交替的阶段(隔离和存在镜子)，它记录了以下参数：在水柱中的分布、颜色、运动、竞争行为、背鳍位置和姿势。为了量化葡萄糖、甘油三酯、总蛋白质和皮质醇水平，在每次拍摄后收集血液样本。用非参数Kruskal-Wallis方法对所得平均值进行统计分析。保持在黑色和绿色背景中的鱼表现出较低的争斗行为频率，而保持在白色背景中的鱼表现出较高的频率，即使如此，警戒模式的数量也很少，并且不改变其运动能力。服从棕色和蓝色的动物表现出最高频率的争斗行为和更大的运动性。在所有处理中，鱼都以明显的颜色停留，占据水柱底部的频率较高。葡萄糖、甘油三酯和总蛋白浓度在各处理间差异不显著，但在镜面反射自身形象时，维持在蓝色和棕色背景下的动物仍可获得较高水平的皮质醇。这些结果表明，背景颜色对社会压力有影响，特别是在同种个体之间的激励性相互作用和激素皮质醇的浓度上。结果表明，绿色和黑色是物种维持的首选颜色，因为它们活跃了竞争的相互作用和胁迫，而棕色和蓝色则应避免，因为它们刺激了这些答案。
It was studied the behavior and physiologic answers of juvenile of Nile tilapia, Oreochromis niloticus, submitted the different backgrounds colors and social situations. The animals were maintained isolated in fishbowls covered with colored paper-card, composing five treatments (black, green, brown, blue and white). Through weekly filmings and in different and alternate stages (isolation and presence of a mirror), it enrolled the following parameters: distribution in the column of water, coloration, motility, agonistic behaviors, position of the dorsal fin and posture. For quantification of the glucose, triglycerides, total proteins and cortisol levels, were collected samples of blood after each filming. The obtained averages were analyzed statistically through the no-parametric Kruskal-Wallis method. The fish maintained in the black and green background presented low frequencies of agonistic behaviors, while those maintained in the white background, high frequencies, even so with low numbers of the alert pattern and not altering its motility. Animals submitted to the brown and blue colors presented the highest frequencies of agonistic behaviors, and larger motility. The fish stayed in all the treatments with the clear coloration, occupying, with larger frequency, the bottom of the column of water. Significant differences were not observed for the glucose, triglycerides and total proteins concentrations among the treatments, even so it was obtained a high level of cortisol for the animals maintained in the blue and brown backgrounds when submitted to the reflection of the own image in mirror. These results showed that there is influence of the background color on the social stress, in particular in the agonistic interactions among individuals of the same specie and in the concentration of the hormone cortisol. It was ended that the green and black colors are recommended to the maintenance of the species, for they liven up the agonistic interactions and the stress, while the brown and blue should be avoided for they stimulate these answers.