Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli

Qiuhua Zhu; Guoying Qian; Youling Gao; Caisheng Wang

doi:10.1007/s00343-009-0063-6

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Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli

OriginalPaper | Updated：2023-05-16

- Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli
- Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli
- 海洋湖沼学报（英文） 2009年27卷第1期页码：63-68
- Affiliations：
  
  College of Biological and Environmental Sciences Zhejiang Wanli University
- Author bio：
- Funds：
  
  Supported by Scientific Research Project Grant (No.2004C100059) from the city government of Ningbo, China.
- DOI：10.1007/s00343-009-0063-6
  中图分类号：
- 网络首发：2009-03-27，
  
  纸质出版：2009
- Accepted：
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Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli[J]. 海洋湖沼学报（英文）, 2009,27(1):63-68.

Zhu, Q., Qian, G., Gao, Y. et al. Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli, ., Chin. J. Ocean. Limnol. 27, 63–68 (2009). https://doi.org/10.1007/s00343-009-0063-6
Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli[J]. 海洋湖沼学报（英文）, 2009,27(1):63-68. DOI： 10.1007/s00343-009-0063-6.

Zhu, Q., Qian, G., Gao, Y. et al. Assessment of nitrogen maintenance requirement in juvenile Black Porgy Acanthopagrus schlegeli, ., Chin. J. Ocean. Limnol. 27, 63–68 (2009). https://doi.org/10.1007/s00343-009-0063-6 DOI：

摘要

Abstract

Nitrogen balance method and nitrogen-free diet were used in this study to determine nitrogen maintenance requirement (NM) and nitrogen maintenance requirement per unit metabolism body weight (NM′) of black porgy Acanthopagrus schlegeli. Fish with body weight (BW) of 50

120

160 and 200 g were fed by the diets containing three graded levels of crude protein (380

420 and 460 g/kg). The results from nitrogen balance experiment showed that the amount of nitrogen deposition varied from 0.15 to 0.31 mg/g BW per day

accounting for 12.2% to 21.1% of nitrogen intake. The amount of fecal nitrogen excretion varied from 0.21 to 0.32 mg/g BW per day

accounting for 16.3% to 21.6% of nitrogen intake. The endogenous nitrogen excretion

a main part of nitrogen consumption varied from 0.79 to 0.97 mg/g BW per day

accounting for 63.3 % to 68.0% of nitrogen intake. Positive correlation was found between NM and body weight

while a negative correlation was found between NM of unit body weight and the growth duration. No significant differences (p>0.05) were found in NM′ among different growth stages. The average of NM′ was 0.485 7mg/g per day. The results from nitrogen-free diet experiment showed that a negative correlation between NM and feed intake of nitrogen-free diet. NM increased with the decrease of feed intake of fish. The average of NM was 0.482 9 mg/g BW per day that was close to 0.483 8 mg/g BW obtained from fish with 120 g BW in nitrogen balance experiment. The nitrogen balance method is recommended to be a better method for determining NM in consideration of fish stress and result stability. This study also provides a calculated result of the protein content in diets

which is necessary for maintaining fish body protein at different growth stages. The calculation was based on the amount of nitrogen required for maintaining body protein per kg BW.

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references

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