The present study explored the relationships between the personality traits boldness, activity, exploration, and sociability, and lateralized utilisation of brain hemispheres in the hatchery-reared juveniles of Deccan Mahseer (Tor khudree), an endangered megafish inhabiting the rivers of central and southern India. Our results revealed a significant positive correlation between boldness, activity and exploratory traits in this species when tested in isolation. Boldness was also positively correlated with the time spent near a conspecific individual, but not with an alien invasive heterospecific tilapia (Oreochromis mossambicus). Although juvenile Deccan Mahseer exhibited significantly greater preference towards conspecific over heterospecific, no divergence in the utilisation of right or left eye was seen while observing these individuals, suggesting the lack of lateralised utilisation of brain hemispheres. Furthermore, laterality in visual perception did not show any significant correlation with any of the personality traits tested in this species. Positive correlations between boldness and sociability in hatchery-reared mahseer populations could result in divergent patterns of dispersion, while absence of laterality may reflect cognitive deficits induced by homogeneous rearing conditions. A greater understanding of such behavioural patterns could help improve rearing practices and inform release protocols for the purposes of conservation of this endangered species.

中文翻译：

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“大胆者善于交际”：本土巨型鱼德干马西尔 (Tor khudree) 的个性特征和侧向性

本研究探讨了 Deccan Mahseer (Tor khudree) 是一种栖息在印度中部和南部河流中的濒危巨型鱼，其在孵化场饲养的幼鱼中，个性特征大胆、活跃、探索和社交能力与大脑半球的侧向利用之间的关系. 我们的结果显示，当单独进行测试时，该物种的大胆、活跃和探索性状之间存在显着的正相关。大胆也与在同种个体附近花费的时间呈正相关，但与外来入侵的异种罗非鱼（Oreochromis mossambicus）无关。尽管幼年德干马西尔对同种比异种更偏爱，但在观察这些个体时没有发现右眼或左眼的利用差异，表明缺乏对大脑半球的侧向利用。此外，视觉感知的偏侧性与该物种中测试的任何人格特征均未显示出任何显着相关性。孵化场饲养的马海尔种群的胆量和社交能力之间的正相关可能导致分散的不同模式，而没有偏侧性可能反映了同质饲养条件引起的认知缺陷。更好地了解此类行为模式可以帮助改进饲养实践，并为保护这种濒危物种的目的提供释放协议。孵化场饲养的马海尔种群的胆量和社交能力之间的正相关可能导致分散的不同模式，而没有偏侧性可能反映了同质饲养条件引起的认知缺陷。更好地了解此类行为模式可以帮助改进饲养实践，并为保护这种濒危物种的目的提供释放协议。孵化场饲养的马海尔种群的胆量和社交能力之间的正相关可能导致分散的不同模式，而没有偏侧性可能反映了同质饲养条件引起的认知缺陷。更好地了解此类行为模式可以帮助改进饲养实践，并为保护这种濒危物种的目的提供释放协议。