Effects of Starvation on Body Chemical Composition and Energy Density in Juvenile Nile tilapia (Oreochromis niloticus)
2012
WANG Wen | WANG Qian-qian | ZHANG Yu-rong | HUANG Qing-da | LUO Yi-ping
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=14.727e0.0065t (r2=0.707, n=37, p<0.05)、FAT=2.295 5e0.0366t(r2=0.552, n=37, p<0.05) and E=4.478 1e0.0113t(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 9e0.0013t(r2=0.566, n=37, p<0.05) and ASH=4.467 8e0.0083t(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.
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