Effects of feeding frequency on growth, feed utilization, digestive enzyme activity and body composition of Litopenaeus vannamei in biofloc-based zero-exchange intensive systems
Effects of feeding frequency on growth, feed utilization, digestive enzyme activity and body composition of Litopenaeus vannamei in biofloc-based zero-exchange intensive systems
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基于生物絮团的零交换集约化系统中饲喂频率对凡纳滨对虾生长、饲料利用率、消化酶活性和身体成分的影响
DOI：
10.1016/j.aquaculture.2020.735079
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发表时间：
2020-05
期刊：
影响因子：
4.5
通讯作者：
Yucheng Cao
中科院分区：
文献类型：
--
作者：
Wujie Xu;Yu Xu;Haochang Su;Xiaojuan Hu;Yunna Xu;Zhuojia Li;Guoliang Wen;Yucheng Cao
通过为期8周的饲养实验，研究每日饲养频率对基于生物絮团的零交换精养系统饲养的凡纳滨对虾幼鱼生长、饲料利用率、消化酶活性和身体成分的影响。该实验在 12 个装有 800 L 富含生物絮凝剂的水的水箱中进行。幼虾（1.52 ± 0.37 g）被放入 240 虾池−1（300 ind m−3）的池中。实验组F3、F6、F12在一天24小时内均匀设置3次、6次、12次三种喂食频率。每组随机分配4个池，根据F3组饲养盘的监测，以相同的每日投喂量培养虾8周。实验过程中，所有监测水质参数均保持在对虾养殖可接受的范围内。实验结束时，三组对虾成活率均高于89.03%。值得注意的是，随着每日投喂次数从3次增加到6次，进一步增加到12次，发现显着差异如下：（1）对虾的最终重量、生长速度和产量增加； (2)饲料转化率下降，蛋白质效率和蛋白质产值上升； (3)虾胃中蛋白酶、淀粉酶比活性和消化腺脂肪酶比活性升高； (4)虾全身粗蛋白含量增加，水分含量下降。综上所述，这些结果表明，每日饲喂频率可以影响在基于生物絮团的零交换集约化系统中饲养的南美白对虾幼鱼的生长、饲料利用率、消化酶活性和身体成分。在一天 24 小时内频繁分配受控的每日饲料量，有利于在受控条件下基于南美白对虾生物絮团的系统的生长、饲料利用率、营养物质消化和蛋白质沉积。
An eight-week feeding experiment was conducted to investigate the effects of daily feeding frequency on the growth, feed utilization, digestive enzyme activity and body composition ofLitopenaeus vannameijuvenile reared in biofloc-based zero-exchange intensive culture systems. The experiment was carried out in twelve tanks with 800 L of biofloc-rich water. Juvenile shrimp (1.52 ± 0.37 g) were stocked into tanks at 240 shrimp tank−1(300 ind m−3). Three feeding frequencies of three, six, twelve times were evenly set in the 24 h of a day for experimental groups of F3, F6, F12 respectively. Each group had four randomly assigned tanks, and the shrimp were cultured for eight weeks with the same daily ration based on the monitoring of feeding trays in F3 group. During the experiment, all the monitored water quality parameters were maintained within acceptable ranges for shrimp culture. At the end of the experiment, the shrimp survival rate was higher than 89.03% in all the three groups. Notably, with the increase of daily feeding frequency from three times to six and further to twelve, significant differences were found as follows: (1) the final weight, growth rate and yield of the shrimp increased; (2) the feed conversion rate decreased while the protein efficiency ratio and protein productive value increased; (3) the specific activities of protease and amylase in the stomach of the shrimp and the specific activity of lipase in the digestive gland increased; (4) the crude protein content of the whole body of the shrimp increased while the moisture content decreased. Taken together, these results demonstrate that daily feeding frequency can affect the growth, feed utilization, digestive enzyme activity and body composition of L.vannameijuvenile reared in biofloc-based zero-exchange intensive systems. Distributing a controlled ration of daily feed at frequent times during 24 h of a day is beneficial for the growth, feed utilization, nutrient digestion, and protein deposition of L.vannameiin biofloc-based systems under controlled conditions.
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