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Effect of Different Opening Diet on the Growth, the Structure of the Digestive Tract and Digestive Enzyme Activity of Larval and Juvenile Mystus macropterus

文献类型： 外文期刊

作者： Li, Xiaoli 1 ; Wu, Xingbing 1 ; Li, Xuemei 1 ; Wei, Nian 1 ; Jiang, Ming 1 ; Zhu, Yongjiu 1 ; Zhu, Tingbing 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Key Lab Freshwater Biodivers Conservat, Minist Agr & Rural Affairs, Wuhan 430223, Peoples R China

关键词： Mystus macropterus; larvae and juveniles; opening diets; growth; digestive tract morphology and enzyme activity

期刊名称：BIOLOGY-BASEL （ 影响因子：3.5； 五年影响因子：4.0 ）

ISSN：

年卷期： 2024 年 13 卷 9 期

页码：

收录情况： SCI

摘要： Simple Summary: Mystus macropterus, a commercially significant Mystus fish species found in the Yangtze River and Pearl River, is currently experiencing a rapid decline attributed to the construction of hydraulic engineering projects, water pollution, and overfishing. Consequently, extensive artificial breeding efforts are being undertaken for large-scale commercial aquaculture purposes as well as for reintroducing this fish back into its natural habitat. Our aim was the evaluation of the effect of different opening diets on the growth, the structure of the digestive tract, and digestive enzyme activity of larval and juvenile M. macropterus. It is recommended to include Tubifex in the diet of M. macropterus larvae during the standardized farming process. One of the crucial factors influencing the growth and viability of larvae and juveniles is their opening diets. The objective of this study was to identify suitable initial feed options for M. macropterus larvae and juveniles. A total of 1200 newly hatched M. macropterus with an average weight of 18.3 mg and an average length of 11.58 mm were selected and randomly divided into four groups. The fish were fed with different opening diets, including rotifer, Artemia nauplii, Tubifex, and micro-diet from six days after hatching (dahs), respectively. Growth indices and activities of digestive enzymes were assessed at 10, 15, 20, 25, 30, 35, and 40 dahs. Histological examination of the structure of the digestive tract was performed at 40 dahs, while survival rates were also documented. The results demonstrated that different diets had no effect on the survival rate of larvae and juveniles of M. macropterus. The growth performance indices were ranked as follows: Tubifex group > Artemia nauplii group > micro-diet group > rotifer group. Remarkably, the Tubifex group exhibited superior growth performance, which was also reflected in the structure of the digestive tract and digestive enzyme activity. Therefore, it is recommended to include Tubifex in the diet of M. macropterus larvae and juvenile during the standardized farming process.

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