Behavioural lateralization, the asymmetric expression of cognitive functions, is reported to enhance key fitness-relevant traits such as group coordination, multitasking and predator escape. Therefore, studies reporting negative effects on lateralization in fish due to environmental stressors such as ocean acidification, hypoxia and pollutants are worrisome. However, such studies tend to use a detour test and focus on population level measures, without validating whether lateralization is consistent within individuals across time. We conducted a multispecies, international assessment of the repeatability (R) of lateralization in four previously studied fish species using a detour test (T-maze), a common method for testing lateralization. We also reanalysed a published data set on a fifth species using new statistical methods. We expected the three shoaling species to exhibit greater within-individual consistency in lateralization than their nonshoaling counterparts given previous reports of stronger lateralization in group-living fishes. Absolute and relative lateralization scores were highly nonrepeatable in all five species (0.01

中文翻译：

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绕道测试中的行为偏侧化在鱼类中是不可重复的

据报道，行为偏侧化是认知功能的不对称表达，可增强关键的健康相关特征，如群体协调、多任务处理和捕食者逃逸。因此，报告由于海洋酸化、缺氧和污染物等环境压力因素对鱼类单侧化产生负面影响的研究令人担忧。然而，此类研究倾向于使用绕道测试并专注于人口水平的测量，而没有验证个人内部的侧化是否在不同时间是一致的。我们使用绕道测试（T 迷宫）（一种测试侧化的常用方法）对先前研究的四种鱼类的侧化重复性 (R) 进行了多物种国际评估。我们还使用新的统计方法重新分析了有关第五个物种的已发布数据集。鉴于之前关于群居鱼类更强的侧化的报道，我们预计这三种浅滩物种在单侧化方面表现出比非浅滩物种更大的个体内部一致性。绝对和相对偏侧化评分在所有五个物种中都高度不可重复（0.01