Role of the Trunk Musculatures in Oviposition of Chum Salmon, Oncorhynchus keta
Role of the Trunk Musculatures in Oviposition of Chum Salmon, Oncorhynchus keta
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躯干肌肉组织在鲑鱼产卵中的作用
DOI：
10.2331/suisan.46.395
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发表时间：
1980
影响因子：
0.4
通讯作者：
T. Hibiya
中科院分区：
文献类型：
--
作者：
K. Uematsu;K. Yamamori;I. Hanyu;T. Hibiya
对在小水箱中自然产卵的雌性鲑鱼进行了肌电图研究。电极被植入鱼的背侧、腹侧和侧躯干肌肉组织（LTM）的深色部分。结果发现，每个记录点都会产生持续几秒（3.45-6.50 秒）的强烈电势爆发（500-800 μV），同时鱼将卵挤出。这表明几乎所有的LTM在产卵期间都持续痉挛性收缩。据推测，LTM的连续同步收缩会导致腹压增加，从而将排卵的卵子通过生殖器开口挤出。鲑鱼产卵所涉及的肌肉和神经机制与游泳时的肌肉和神经机制不同，游泳时左右 LTM 会发生短暂的交替收缩，而不是长时间的痉挛。可能在高级中枢神经系统中，有一个（或多个）中枢优于脊髓运动中枢，并且仅在鱼产卵时才发挥作用。
An electromyographic study was conducted on the female chum salmon which engaged in natural spawning in a small tank. Electrodes were implanted in the dorsal, ventral, and dark portions of the lateral trunk musculature (LTM) of the fish. It was found that every site of recording gave a strong burst of potentials (500-800 μV) lasting several seconds (3.45-6.50 s), simultaneously with extrusion of eggs by the fish. This indicates that almost all LTM keep on contracting convulsively during oviposition. Presumably, the continuous and synchronous contractions of LTM produce an increase in the abdominal pressure, by which the ovulated eggs are squeezed out through the genital opening. The muscular and neural mechanisms involved in oviposition of salmon are different from those in swimming, when short, alternative contractions of the left and the right LTM, instead of a long spasmodic, take place. It may be that in the higher CNS there is a center (or centers) which is superior to the spinal locomotive centers and functions only when the fish oviposits.