Effect of feeding level on growth, digestive and metabolic enzymes and antioxidant capacity in juvenile Yangtze sturgeon (Acipenser dabryanus)
文献类型: 外文期刊
作者: He, Bin 1 ; Zhou, Bo 1 ; Xie, Hang 2 ; Hu, Zeng-Tan 1 ; Wang, Bin 1 ; Zhang, Jun -Lin 1 ; Li, Qing-Zhi 1 ; Zhao, Feng-Qi 1 ; Liu, Xing 2 ; Li, Qian-Dong 1 ; Yan, Tao 1 ;
作者机构: 1.Fishery Inst Sichuan Acad Agr Sci, Chengdu 611731, Sichuan, Peoples R China
2.Luzhou City Agr & Rural Bur, Chengdu 646000, Sichuan, Peoples R China
关键词: Feed level; Growth performances; Hepatic enzymes; Metabolism; Antioxidant enzymes; Yangtze sturgeon
期刊名称:AQUACULTURE ( 影响因子:4.5; 五年影响因子:4.6 )
ISSN: 0044-8486
年卷期: 2023 年 567 卷
页码:
收录情况: SCI
摘要: This study was performed to evaluate the effects of different feeding levels on the growth performance, digestive enzymes, body composition, metabolic enzymes and antioxidant activities of juvenile Yangtze sturgeon (Aci-penser dabryanus). A total number of 135 fish (average initial weight of 67.80 +/- 0.19 g) were randomly distributed into nine round fibre-reinforced plastic tanks with 15 fish per tank and three tanks for treatment. Fish were fed with three feeding levels [1%, 3% and 5% body weight per day (BW day-1)] twice per day for 8 weeks. The weight gain rate (WGR) and specific growth rate (SGR) in 3% BW day-1 treatment were significantly higher and the feed conversion ratio (FCR) was significantly lower than those in the other treatments (P < 0.05). The activities of amylase and lipase were significantly increased with increasing feeding levels, and fish fed with 3% BW day-1 had significantly higher trypsin activities (P < 0.05). The hepatic glucogen contents significantly increased with increasing feeding levels, and the highest glucogen levels in the muscles were found in 3% BW day-1 treatment (P < 0.05). The enzymes activites of liver metabolism significantly differed among fish fed with different dietary levels. Fish fed with 1% BW day-1 had higher hepatic Na+/K + -ATPase (NKA) and glucose-6-phosphate dehydrogenase (G6PDH) activities than others, whereas fish fed with 3% BW day-1 had the highest muscle phospho-pyruvate kinase (PK) and G6PDH (P < 0.05). Fish reared with 5% BW day-1 had the highest total antioxidant capacity (T-AOC) and superoxide dismutase (SOD) activity and the lowest malondialdehyde (MDA) contents in the liver. Fish fed with 3% BW day-1 had the highest antioxidant indices [T-AOC, SOD and glutathione peroxidase (GSH-PX)] and the lowest MDA contents in the muscles (P < 0.05). Based on WG, SGR, FCR, digestive enzyme activities, and nutrient absorption and utilisation, the recommended feeding level for juvenile Yangtze sturgeon (average initial weight of 67.80 +/- 0.19 g) is 3% BW day-1 when they are kept at 20.3 +/- 1.3 degrees C. These data reveal that fish would tend to balance metabolism and growth by optimising nutrient absorption and utilisation when fed at different dietary levels.
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