The aim of this study was to explore the effects and mechanisms of different starvation treatments on the compensatory growth of Acipenser dabryanus. A total of 120 fish (60·532 (sem 0·284) g) were randomly assigned to four groups (fasting 0, 3, 7 or 14 d and then refed for 14 d). During fasting, middle body weight decreased significantly with prolonged starvation. The whole-body and muscle composition, serum biochemical indexes, visceral indexes and digestive enzyme activities had been effected with varying degrees of changes. The growth hormone (GH) level in serum was significantly increased in 14D; however, insulin-like growth factor-1 (IGF-1) showed the opposite trend. The neuropeptide Y (npy) mRNA level in brain was significantly improved in 7D; peptide YY (pyy) mRNA level in intestine was significantly decreased during fasting. After refeeding, the final body weight, percentage weight gain, specific growth rate, feed intake, feed efficiency and protein efficiency ratio showed no difference between 0D and 3D. The changes of whole-body and muscle composition, serum biochemical indexes, visceral indexes and digestive enzyme activities had taken place in varying degrees. GH levels in 3D and 7D were significantly higher than those in the 0D; the IGF-1 content decreased significantly during refeeding. There was no significant difference in npy and pyy mRNA levels. These results indicated that short-term fasting followed by refeeding resulted in full compensation and the physiological and biochemical effects on A. dabryanus were the lowest after 3 d of starvation and 14 d of refeeding. Additionally, compensation in A. dabryanus may be mediated by appetite genes and GH, and the degree of compensation is also affected by the duration of starvation.

中文翻译：

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饥饿和再投喂对长吻鲟生长性能、食欲、生长激素-胰岛素样生长因子轴水平和消化功能的影响

本研究的目的是探讨不同饥饿处理对鲢鱼代偿性生长的影响和机制。鲟鱼. 共120条鱼（60·532（扫描仪0·284) g) 被随机分为四组（空腹0、3、7或14天，然后再喂14天）。在禁食期间，随着饥饿时间的延长，中等体重显着下降。全身及肌肉成分、血清生化指标、内脏指标及消化酶活性均有不同程度的变化。14D血清中生长激素（GH）水平显着升高；然而，胰岛素样生长因子-1（IGF-1）却呈现出相反的趋势。神经肽 Y (npy) 脑中的 mRNA 水平在 7D 中显着提高；肽YY（pyy) 禁食期间肠道中的 mRNA 水平显着降低。再饲喂后，最终体重、增重百分比、比生长率、采食量、饲料效率和蛋白质效率比在0D和3D之间没有差异。全身及肌肉成分、血清生化指标、内脏指标及消化酶活性均有不同程度的变化。3D和7D的GH水平显着高于0D；再喂食期间IGF-1含量显着下降。没有显着差异npy和pyymRNA水平。这些结果表明，短期禁食后再喂食导致完全代偿和生理生化效应A. dabryanus在饥饿 3 d 和再喂食 14 d 后最低。此外，补偿在A. dabryanus可能由食欲基因和GH介导，代偿程度也受饥饿持续时间的影响。