饥饿对尼罗罗非鱼幼鱼粗化学成分的影响 (动物科学)

为讨论尼罗罗非鱼(Oreochromis niloticus)幼鱼的鱼体化学成分和能量密度随饥饿时间延长的变化规律,2010年1月采集初始体质量为(3.61±0.13)g的尼罗罗非鱼幼鱼40尾,以饥饿处理0 d为对照,将饥饿处理8、15、22和45 d分为4个组,分别测定所有材料的鱼体化学成分,估算了能量密度。结果表明,随饥饿时间(t)天数的延长,尼罗罗非鱼幼鱼的蛋白质含量(PRO)、脂肪含量(FAT)和能量密度(E)降低,可以分别描述为方程PRO=14.727e-0.006 5 t(r2=0.707,n=37,p<0.05)、FAT=2.295 5e-0.036 6 t(r2=0.552,n=37,p<0.05)和E=4.478 1e-0.011 3 t(r2=0.694,n=37,p<0.05);随饥饿时间(t)天数的延长,含水量(WAT)和灰分含量(ASH)升高,可以分别描述为方程WAT=76.1969 e0.001 3 t(r2=0.566,n=37,p<0.05)和ASH=4.467 8 e0.008 3 t(r2=0.729,n=37,p<0.01);PRO、FAT和E均分别与WAT呈显著的负线性关系,可以分别描述为方程PRO=61.969 9-0.625 1WAT(r2=0.740,n=37,p<0.05)、FAT=47.908 8-0.593 8 WAT(r2=0.899,n=37,p<0.05)和E=33.548 9-0.382 1 WAT(r2=0.955,n=37,p<0.05)。研究认为该种鱼在饥饿初期大量消耗脂肪,并随着饥饿时间的延长,净耗量逐渐减少,同时在整个饥饿过程消耗蛋白质。

Effects of Starvation on Body Chemical Composition and Energy Density in Juvenile Nile tilapia(Oreochromis niloticus)

40 specimens of juvenile Nile tilapia(Oreochromis niloticus)(initial weight:(3.61±0.13) g) were divided into 5 groups,and were starved for 0,8,15,22 and 45d respectively.Body chemical compositions were measured and energy density was estimated during starvation.The results showed that the contents of protein(PRO),lipid(FAT) and energy density(E) are negatively related to starvation.The relationships between PRO,FAT,or E and starvation time(t,unit: d) could be described as: PRO=14.727e0.006 5t(r2=0.707,n=37,p<0.05)、FAT=2.295 5e0.036 6t(r2=0.552,n=37,p<0.05) and E=4.478 1e0.011 3t(r2=0.694,n=37,p<0.05) The contents of water(WAT) and ash(ASH) are positively related to starvation.The relationships between WAT or ASH and t could be described as: WAT=76.196 9e0.001 3t(r2=0.566,n=37,p<0.05) and ASH=4.467 8e0.008 3t(r2=0.729,n=37,p<0.01);the contents of protein(PRO),lipid(FAT) and energy density(E) are negatively related to the contents of water(WAT),the relationships between PRO,FAT or E and WAT could be described as: PRO=61.969 9 0.625 1WAT(r2=0.740,n=37,p<0.05)、FAT=47.908 8 0.593 8WAT(r2=0.899,n=37,p<0.05) and E=33.548 9 0.382 1WAT(r2=0.955,n=37,p<0.05).Lipid was mainly consumed during short term starvation and the net consumption gradually reduced with prolonged starvation,and protein was also consumed throughout the whole starvation process.