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Energy Utilization Pattern and Survival Strategy in Starvation Juvenile Pampus argenteus

  • YAN Xuemei ,
  • GU Jiangwen ,
  • GUO Xiaoge ,
  • GONG Jianhua ,
  • XU Shanliang
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  • School of Marine Sciences, Ningbo University, Ningbo 315211, China

Received date: 2015-06-04

  Online published: 2015-12-14

Abstract

To reveal the energy utilization pattern of juvenile Pampus argenteus on starvation stress, the biochemical components such as crude protein, crude fat, ash contents of whole fish with gutted and the activities of pepsin, trypsin, lipase and amylase in liver and gastrointestinal tract were analyzed by using the juvenile P. argenteus[body weight:(2.61±1.05) g] in hunger 0(S0 group), 3(S3 group), 5(S5 group), 7(S7 group) and 9 days(S9 group), respectively. The results showed as follows:1) the crude protein content significantly decreased during starvation(P<0.05), the cumulative loss rate of crude protein was up to 15.23% in hunger 9 days, and the biggest loss rate appeared in the 7th day which was up to 5.51%. At that moment, pepsin activity in liver and gastrointestinal tract significantly increased(P<0.05). 2) The crude fat content decreased rapidly in earlier starvation period, the loss rate of crude fat was up to 77.86% in hunger 5 days. At that moment, the activities of lipase in liver and gastrointestinal tract also reached their highest points which were 1.5 and 1.4 times of S0 group(P<0.05), respectively. Then the consumption of crude fat significantly reduced(P<0.05), and lipase activity also plummeted. 3) With the declining of crude protein and crude fat contents, the content of ash increased continuously which strongly increased 1.7 times in hunger 3 days compared S0 group(P<0.05). 4) The nitrogen-free extract content was a non-significant reduced in earlier starvation period(P>0.05), while it decreased to 0.61% in the 9th day, and the relative loss rate of crude protein was up to 28.15%(P<0.05). At that moment, amylase activity in liver increased from 0.31 U/mg(S0 group) to 0.69 U/mg, which reached the peak. 5) Change of energy content in fish body confirmed the energy utilization pattern of starvation juvenile P. argenteus. Thus survival strategy of juvenile P. argenteus in starvation is that it mainly consumes the fat as energy in earlier starvation period, and uses the protein as the main energy with the prolongation of starvation. With the close to the limit in use of protein and fat, it can only increase the carbohydrate utilization in later starvation period.

Cite this article

YAN Xuemei , GU Jiangwen , GUO Xiaoge , GONG Jianhua , XU Shanliang . Energy Utilization Pattern and Survival Strategy in Starvation Juvenile Pampus argenteus[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3975 -3983 . DOI: 10.3969/j.issn.1006-267x.2015.12.040

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