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首页> 外文期刊>Turkish Journal of Fisheries & Aquatic Sciences >Effect of various lengths of single phase starvation on compensatory growth in rainbow trout under summer conditions (Oncorhynchus mykiss).
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Effect of various lengths of single phase starvation on compensatory growth in rainbow trout under summer conditions (Oncorhynchus mykiss).

机译：在夏季条件下，各种长度的单相饥饿对虹鳟代偿性生长的影响（Oncorhynchus mykiss）。

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摘要

This study was conducted to determine the effects of various lengths of starvation periods on following compensatory growth (CG) in rainbow trout under summer conditions (18.1 degrees C and day length of 12.5-14.5 hours). Five treatments with triplicate tanks were as follows: control (C) fed to satiation over 84 days; one (S1), two (S2), three (S3), and four (S4) weeks of starvation; and then refeeding for the remaining eight weeks of the experiment. Starvation periods induced hyperphagia during refeeding but only S1 and S2 were able to catch up with C. Repeated measures of analysis of variance suggested a convergence in body mass but not in body length (structure). Organo-somatic indices of the starvation groups were significantly reduced at the end of starvation periods and restored to levels of the control fish within the first two weeks of the refeeding period. Broadly speaking, starvation longer than one week significantly reduced apparent digestibility of dry matter, lipid, and energy compared with the control group but did not affect protein and ash, and a complete recovery in the digestibility coefficients occurred within two weeks of satiation feeding. There was a linear increase in body moisture and a decrease in lipid and lipid/lean body mass ratio with the severity of starvation periods, but these divergences largely disappeared at the end of refeeding. During the starvation period, the protein synthesis rate (estimated using RNA/DNA ratio in the muscle and liver) reduced but in subsequent refeeding period, it increased in starved fish. The findings of the present experiment suggest that an application of single starvation episodes to elicit CG as a management tool in summer conditions should not be longer than two weeks.
机译：进行了这项研究，以确定在夏季条件下（18.1摄氏度，日长为12.5-14.5小时），虹鳟在不同的饥饿时期对随后代偿性生长（CG）的影响。用一式三份的水箱进行五种处理如下：对照（C）在84天内喂饱;饥饿一周（S1），两周（S2），三周（S3）和四周（S4）;然后在实验的剩余八周内重新喂食。饥饿时期在补饲过程中会引起食欲亢进，但只有S1和S2能够赶上C。重复进行方差分析的方法表明，体重会聚，但体长（结构）不会收敛。在饥饿期结束时，饥饿组的有机体指数显着降低，并在喂食期的前两周恢复到对照鱼的水平。广义上讲，与对照组相比，饥饿超过1周会显着降低干物质，脂质和能量的表观消化率，但不影响蛋白质和灰分，饱食后两周内消化率就会完全恢复。随着饥饿时间的延长，体内水分呈线性增加，脂质和脂质/瘦体重比降低，但这些差异在重新喂食结束时基本消失。在饥饿期间，蛋白质合成速率（使用肌肉和肝脏中的RNA / DNA比率估算）降低，但在随后的进食期间，饥饿鱼的蛋白质合成速率提高。本实验的发现表明，在夏季条件下，单次饥饿发作作为诱发CG的一种管理手段的应用不应超过两周。

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