When exposed to predator cues, ostariophysan fishes exhibit short‐term anti‐predator behavioural responses in order to minimise predation risk. Non‐native predator cues are, however, likely to elicit poor behavioural responses in native prey fishes. This study investigated whether chubbyhead barb Enteromius anoplus, a native freshwater minnow in South Africa, had the innate ability to recognise and respond to largemouth bass Micropterus salmoides, a non‐native piscivore. This was experimentally evaluated by investigating behavioural responses to both the non‐native predator's odour and damage‐released conspecific alarm substance (CAS). Chubbyhead barbs did not exhibit any behavioural response to largemouth bass odour both before and after exposure to CAS. This suggests that the chubbyhead barbs likely lacked the innate ability to recognise the non‐native largemouth bass predator kairomones. By comparison, exposure to CAS was associated with significant behavioural responses, with chubbyhead barbs shifting from free‐swimming to hovering, and frequent use of refugia. This suggests that despite ineffective response to non‐native largemouth bass odour, chubbyhead barbs responded to general predator attack. Overall, this study suggests the potential for non‐native largemouth bass to induce negative consumptive effects on chubbyhead barbs due to their inability to identify non‐native predator's odour. In addition, nonconsumptive effects are likely due to altered activities in response to predator attack.

中文翻译：

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捕食者幼稚的min鱼响应其特定警报物质，但不响应来自非本地捕食者的气味

当暴露于捕食者线索时，ostariophysan鱼表现出短期的反捕食者行为反应，以最大程度地减少捕食风险。然而，非本地的捕食者线索可能会引起本地猎物的不良行为反应。这项研究调查是否chubbyhead倒钩Enteromius anoplus，在南非本地的淡水鲦鱼，不得不承认的先天能力和应对大口黑鲈加州鲈，非本地食肉动物。通过调查对非本地捕食者的气味和破坏释放的特定警报物质（CAS）的行为响应，通过实验评估了这一点。胖头倒钩在暴露于CAS之前和之后均未表现出对大口黑鲈气味的任何行为反应。这表明胖头倒钩可能缺乏识别非本地大口黑鲈捕食者海洛门酮的天生能力。相比之下，接触CAS具有明显的行为反应，胖胖的倒刺从自由游泳转变为悬停，并经常使用避难所。这表明，尽管对非本地大口黑鲈气味的反应无效，但胖乎乎的倒钩对一般的捕食者攻击也有反应。总体，这项研究表明，非本地大口黑鲈由于无法识别非本地捕食者的气味而可能对胖头倒钩产生消极的消费影响。此外，非消耗性影响很可能是由于响应掠食者攻击而改变了活动。