Abstract

The dynamics of glycogen recovery in the muscles and liver of the European flounder Plathichthys flesus (Linnaeus, 1758) and the European sprat Sprattus sprattus (Linnaeus, 1758) after exposure to trawl fishing has been studied. As the results show, the stress-inducing effect of fishing does not alter the glycogen content of the organs in the flounder, which leads a sedentary life, whereas a sharp decrease in glycogen is observed in the white and red muscles and the liver of the sprat, which is an actively swimming species. After capture, the dynamics of glycogen recovery in the organs of flounder has an undulatory pattern. The glycogen is completely restored within 12 h and is accompanied by a 100% survival rate of the flounder. The assumption is made that the resynthesis of glycogen in the organs of flounder occurs through the activation of carbohydrate metabolism in the liver. In sprat that had 3 h of “rest” after being caught and then placed in a 100‑liter tank to restore glycogen in tissues, a pronounced (4.5-fold) increase in the level of the polysaccharide was recorded from the white muscles, with a simultaneously low glycogen level in the liver. The glycogen compensation in the sprat possibly occurred through the reverse involvement of lactate in the polysaccharide resynthesis in the white muscles. The following additional 3-h period of rest was characterized by a significant (1.7-fold) decrease in the glycogen level in the white muscles compared to that in the previous rest period. No glycogen recovery in the sprat liver was observed throughout the entire rest period. Apparently, this organ is not involved in the polysaccharide recovery processes. The low survival rate of sprat (30%) is explained by the long exposure to stress caused by both capture and captivity in the tank, to which this “excitable” species is particularly sensitive.

中文翻译：

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底拖网捕捞不同游泳能力鱼类肌肉和肝脏中糖原的恢复模式

摘要

欧洲比目鱼Platthichthys flesus（Linnaeus，1758）和欧洲西鲱Sprattus sprattus的肌肉和肝脏中糖原恢复的动力学（Linnaeus，1758）已经研究了拖网捕鱼后的情况。结果表明，捕捞的压力诱导作用不会改变比目鱼器官的糖原含量，从而导致久坐的生活，而在白，红肌肉和鱼肝中观察到糖原的急剧下降。鲱鱼，这是一个活跃的游泳物种。捕获后，比目鱼器官中糖原恢复的动力学呈波动模式。糖原在12小时内完全恢复，并伴有比目鱼的100％存活率。假定比目鱼器官中糖原的再合成是通过激活肝脏中的碳水化合物代谢而发生的。被捕获后有3小时“休息”的鲱鱼，然后放入100升的水箱中以恢复组织中的糖原，从白色肌肉中记录到多糖水平明显增加（4.5倍），同时肝脏中糖原水平较低。鲱鱼中的糖原补偿可能是由于乳酸反向参与白肌多糖再合成而发生的。接下来的3小时休息期的特征是与之前的休息期相比，白肌糖原水平显着下降（1.7倍）。在整个休息期间，在鼠肝中未观察到糖原的恢复。显然，该器官不参与多糖的回收过程。鲱鱼存活率低（30％）的原因是由于长期受罐内捕获和圈养所造成的压力的影响，