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首页> 外文期刊>Aquaculture >Effects of progressive decrease of feeding frequency and re-feeding on production parameters, stomach capacity and muscle nutritional value in rainbow trout (Oncorhynchus mykiss)
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Effects of progressive decrease of feeding frequency and re-feeding on production parameters, stomach capacity and muscle nutritional value in rainbow trout (Oncorhynchus mykiss)

机译：饲养频率和再喂养对虹鳟鱼生产参数，胃容量和肌肉营养价值的影响（Oncorhynchus mykiss）

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Feeds and feeding constitute the major part of costs in intensive aquaculture. Any action to reduce feeding costs without negatively affecting fish production parameters and flesh quality would improve profitability of farming. Therefore, we studied the effects of feeding frequency on production parameters, stomach capacity and nutritional value of muscle in juvenile rainbow trout (Oncorhynchus mykiss) in an experiment with two stages. First, during the nine-week "starvation period" we fed rainbow trout (initial weight c. 40 g) with four different feeding protocols in an attempt to adapt the fish to a progressive decrease in the number of feeding days. During the second stage, a four-week "re-feeding period", all fish were fed in excess on weekdays. Fish growth, feed intake, stomach size, and biomolecule content of muscle were monitored as response variables. During the starvation period, feed intake and growth decreased along with the number of feeding days. Compensatory growth during the refeeding was either only modest or absent. The fish in the starved groups were unable to significantly increase their stomach capacities. Starvation and re-feeding had only a slight effect on muscle fatty acid and amino acid composition. The used feeding protocols did not affect important production parameters (e.g. feed conversion or size variation). Our results suggest that despite differences in fish growth starvation and re-feeding hardly affect the nutritional value of fish. It is possible that several decades in captivity have made rainbow trout incapable to adjust their stomach size in respect to feeding frequency.
机译：饲料和饲料构成了密集水产养殖成本的主要部分。任何减少饲养成本的任何行动，不会对鱼类生产参数进行负面影响，肉质质量会提高农业的盈利能力。因此，我们研究了少年彩虹鳟鱼（Oncorynchus mykiss）在两个阶段的实验中饲喂喂养频率对肌肉产量，胃容量和营养价值的影响。首先，在九周的“饥饿期”期间，我们用四种不同的喂养方案喂养彩虹鳟（初始重量C.40g），以试图将鱼调整到饲养日次数的逐步减少。在第二阶段，为期四周的“再喂食时期”，所有鱼类都在平日喂过多余的。作为响应变量监测肌肉的生长，饲料摄入，胃大小和生物分子含量。在饥饿期间，饲料摄入和生长随着喂养天数而降低。在再生期间的补偿生长只会谦虚或缺席。饥饿的团体中的鱼不能显着增加他们的胃部容量。饥饿和再喂养对肌肉脂肪酸和氨基酸组成仅产生轻微的影响。使用的喂料协议不影响重要的生产参数（例如，进料转换或尺寸变化）。我们的研究结果表明，尽管鱼类生长饥饿差异并重新喂养几乎不会影响鱼类的营养价值。囚禁中的几十年可能使彩虹鳟鱼能够在喂养频率方面调整胃大小。

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