Miyai Caio Akira, Sanches Fábio Henrique Carretero, Pinho-Neto Cândido Ferreira, Barreto Rodrigo Egydio
Departamento de Fisiologia, Instituto de Biociências, UNESP, Rubião Jr. s/n, 18618-970 Botucatu, São Paulo, Brazil.
Departamento de Fisiologia, Instituto de Biociências, UNESP, Rubião Jr. s/n, 18618-970 Botucatu, São Paulo, Brazil.
Physiol Behav. 2016 Oct 15;165:22-7. doi: 10.1016/j.physbeh.2016.06.033. Epub 2016 Jun 28.
Several fish species exhibit antipredator responses when exposed to chemicals which indicate risk of predation. One such substance is the scent of a predator (a kairomone) that may induce defensive responses in a potential prey. In the present study, we show that chemical cues (odour) from predator fish induce antipredator and stress responses in Nile tilapia. When exposed to predator odour, Nile tilapia decreased activity and increased ventilation rate (VR), but no increase in plasma levels of cortisol and glucose was found. Although the hypothalamic-pituitary-interrenal axis (HPI axis) was not activated, an increase in ventilation is a fast response which can provide the fish enough oxygen for a 'fight or flight' event when facing a predator. Thus, this respiratory response suggests an anticipated adjustment in order to prepare the body for a defensive response, such as escaping, irrespective of HPI axis activation.
当暴露于表明存在捕食风险的化学物质时，几种鱼类会表现出反捕食者反应。其中一种物质是捕食者的气味（一种利它素），它可能会在潜在猎物中引发防御反应。在本研究中，我们表明来自捕食性鱼类的化学信号（气味）会在尼罗罗非鱼中引发反捕食者和应激反应。当暴露于捕食者气味时，尼罗罗非鱼的活动减少，呼吸频率（VR）增加，但未发现血浆中皮质醇和葡萄糖水平升高。尽管下丘脑 - 垂体 - 肾间轴（HPI轴）未被激活，但呼吸频率增加是一种快速反应，当面对捕食者时可为鱼提供足够的氧气以应对“战斗或逃跑”事件。因此，这种呼吸反应表明是一种预期的调整，以便让身体为诸如逃跑之类的防御反应做好准备，而与HPI轴的激活无关。
