Studies on cardiac arrest and restart mechanisms during gamete release in salmon

为了阐明鲑鱼配子释放过程中心脏骤停和再启动的机制，采用碳菁荧光染料（DiI）对鲑鱼心脏的电传导系统进行了观察。发现迷走神经（副交感神经）由内脏分支支配至心脏分支。在多产卵体虹鳟雄鱼的精子释放过程中，心电图记录仪记录到了心室颤动，表明心脏骤停不仅发生在单产卵体虹鳟，也发生在多产卵体虹鳟。鲑鱼配子释放过程中的心脏骤停被认为是与人类的血管迷走神经反应相似的现象，即强烈的疼痛通过迷走神经的传入分支刺激大脑中的血管中枢，导致心率减慢。

In order to clarify cardiac arrest and restart mechanisms during gamete release in salmon, carbocyanine fluorescent dyes (DiI) was used to observe electrical conduction system of the chum salmon heart. It was found that the vagus nerve (parasympathetic nervous) was innervated from the visceral branch to the cardiac branch. During sperm release of male rainbow trout, which is a multiple spawner species, the ventricular fibrillation was recorded by electrocardiogram data-logger suggesting that the cardiac arrest occur not only semelparous species but also polytelic species. The cardiac arrest during gamete release in salmon was considered to the similar phenomena of the vasovagal response in human being that was caused by strong pain stimulating the vasomotor center in the brain via the afferent branch of the vagus nerve, and then decreased the heart rate.