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Gastric evacuation and changes in postprandial blood biochemistry, digestive enzymes, and appetite-related genes in juvenile hybrid grouper (Epinephelus moara female x E. lanceolatus male)

文献类型： 外文期刊

作者： Jia, Yudong 1 ; Gao, Yunhong 1 ; Jing, Qiqi 1 ; Huang, Bin 1 ; Zhai, Jieming 4 ; Guan, Changtao 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, 106 Nanjing Rd, Qingdao 266071, Peoples R China

2.Qingdao Key Lab Marine Fish Breeding & Biotechnol, Qingdao 266071, Peoples R China

3.Qingdao Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China

4.Ming Bo Aquat Co Ltd, Laizhou 261400, Peoples R China

关键词： Gastric evacuation; Blood biochemistry; Intestinal digestive enzyme; Appetite-related genes

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2021 年 530 卷

页码：

收录情况： SCI

摘要： The proportion of remaining stomach meal (PSR), gastric evacuation model, serum cortisol and glucose levels, intestinal lipase, amylase, and chymotrypsin activities and the expression levels of neuropeptide Y (npy), orexin (ore) and leptins (lepa, lepb) of the hybrid grouper (Epinephelus moara female x E. lanceolatus male) during gastric evacuation were evaluated to determine the optimal feeding interval. Results showed that PSR significantly decreased by more than 60%, 70%, and 90% at postprandial 6 h, 9 h and 12 h, respectively. The cubic root curve was the most supported model and fitted all PSR data. The cortisol and glucose levels were significantly varied, and the highest values were obtained at postprandial 6 h. Cortisol and the glucose levels then gradually decreased from postprandial 9 h to postprandial 12 h. Intestinal lipase and chymotrypsin activities showed similar results to cortisol, whereas the amylase activity was not significantly different during gastric evacuation. The hypothalamic npy and ore mRNA levels were gradually up-regulated within postprandial 6 h, and then significantly down-regulated from postprandial 9 to postprandial 12 h. By contrast, hepatic lepa and lepb mRNA levels remained high levels within postprandial 6 h and significantly decreased from postprandial 9 to postprandial 12 h. These results indicated that food digestion in the intestine peaked at postprandial 6 h. Afterward, appetite returned and fully recovered at about postprandial 12 h. Therefore, on the basis of the aforementioned results and considering the fish management, postprandial 12 h is the optimal feeding interval of hybrid grouper (Epinephelus moara female x E. lanceolatus male). This feeding interval offers potential savings in time and labor spent in cultivating hybrid grouper in captivity.

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