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首页> 外文期刊>Fish Physiology and Biochemistry >Effect of feeding on the function and structure of the digestive system in juvenile southern catfish (Silurus meridionalis Chen)
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Effect of feeding on the function and structure of the digestive system in juvenile southern catfish (Silurus meridionalis Chen)

机译：饲喂对南方southern鱼消化系统功能和结构的影响

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Postprandial physiological and morphological responses to feeding were examined in juvenile southern catfish (Silurus meridionalis Chen) that had consumed a loach (Misgurnus anguillicaudatus Cantor) meal equivalent to 6% of the body mass of the catfish. The gastric evacuation rate (GER) peaked at 4 h postfeeding, averaging 0.36 g food weight h-1, at which time 14% of the ingested meal had passed into the intestine. Less than 10% of the ingested meal remained in the stomach at 24 h postfeeding. Pepsin activity peaked at 8 h postfeeding, reaching a level approximately twofold higher than the prefeeding level. Pancreatic trypsin activity peaked at 16 h postfeeding, reaching a level 4.5-fold higher than the prefeeding level. Peaks in lipase activity in both the proximal and middle intestinal segments occurred at 16 h, reaching 2.8- and 2.4-fold higher levels than the prefeeding level, respectively, while the activity in the distal intestine segment reached a level 2.9-fold higher than the prefeeding level at 24 h postfeeding. With respect to amylase activity, only the middle intestinal segment exhibited a change, first an increase and then a decrease, after feeding. Feeding also triggered an approximately 200% increase in the metabolic rate and resulted in 44.6 kJ kg-1 being expended on specific dynamic action, equivalent to 16.1% of the meal's energy. In terms of organ size, the wet mass of the liver increased by 11% at 24 h postfeeding, whereas the wet mass of the pancreas did not change. Except for a decrease in the thickness of the submucosa in the middle intestinal segment, the thickness of the intestinal fold, mucosa, submucosa, muscularis and serosa of each intestinal segment did not change significantly with feeding. These results suggest that the continuum of physiological responses observed with respect to metabolic increases, GER, regulation of pancreatic and intestinal digestive enzyme activities and liver wet mass to feeding corresponds to the changes in the demand on the digestive system in S. meridionalis. Moreover, species maintained stable gastrointestinal tract morphology during the short interval of repeated feeding.
机译：在南部southern鱼（Silurus meridionalis Chen）的餐后对饲喂的生理和形态反应进行了研究，该南方fish鱼的泥a（Misgurnus anguillicaudatus Cantor）进食了相当于鱼体重6％的膳食。进食后4小时，胃排空率（GER）达到峰值，平均为0.36 g食物重量h -1 ，这时摄入的膳食中有14％已进入肠道。喂食后24小时内，不到10％的进餐食物残留在胃中。胃蛋白酶活性在喂食后8小时达到峰值，达到大约比喂食前水平高两倍的水平。胰腺胰蛋白酶活性在喂食后16 h达到峰值，达到比喂食前水平高4.5倍的水平。在近端和中段肠段的脂肪酶活性均在16 h达到峰值，分别比喂食前高2.8倍和2.4倍，而远端肠段的脂酶活性则比进食前高2.9倍。喂食后24小时的喂食水平。关于淀粉酶活性，进食后仅中肠段表现出变化，首先增加，然后减少。进食还引发了代谢率大约200％的增加，并导致44.6 kJ kg -1 通过特定的动态作用消耗，相当于膳食能量的16.1％。就器官大小而言，喂食后24 h肝脏的湿重增加了11％，而胰腺的湿重没有变化。除了中肠段粘膜下层的厚度减少外，每个肠段的肠褶皱，粘膜，粘膜下层，肌层和浆膜的厚度均未随进食而发生明显变化。这些结果表明，观察到的关于代谢增加，GER，胰腺和肠道消化酶活性的调节以及肝脏对采食的湿重的生理反应的连续性对应于对子午线虫消化系统需求的变化。此外，在反复进食的短暂间隔内，物种保持了稳定的胃肠道形态。

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