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Influence of dietary protein levels on growth, digestibility, digestive enzyme activity and stress tolerance in white-leg shrimp, Litopenaeus vannamei (Boone, 1931), reared in high-density tank trials S Xia et al. Influence of dietary protein levels on Litopenaeus vannamei

Authors :
Sudong Xia
Yong Li
Wenqi Wang
Rajkumar, Mayalagu
Kumaraguru Vasagam, Kumaravel Paramasivam
Hua Wang
Source :
Aquaculture Research. Nov2010, Vol. 41 Issue 12, p1845-1854. 10p. 5 Charts, 1 Graph.
Publication Year :
2010

Abstract

The effects of dietary protein (DP) levels on the growth, digestibility, digestive enzyme activity and stress tolerance of Litopenaeus vannamei (Boone, 1931) were investigated in high-density (375 m) tank trials. Shrimps (6.2 ± 0.2 g) were fed diets with five different protein levels (31%, 35%, 39%, 43% and 47%) for 60 days. The results showed that variations in DP significantly ( P<0.05) influenced the growth performance, digestibility, enzyme activity and their ability to tolerate stress. Weight gain showed a linear increase in relation to crude protein (CP) up to 43% and showed a slight decrease with a further increase to 47%. Feed conversion ratio was observed to be the lowest in CP 43%: 2.53. A higher protein efficiency ratio was observed with the low-protein diet CP31 (1.07); however, it was not significantly different from the rest of the dietary treatments. Protein digestibility was the highest (75.71%) in CP47 and the lowest (71.94%) in CP31. Protease activity ranged between 63.7 and 70.2 (U Protein), and showed a positive correlation with the DP levels. Shrimp fed CP43 well tolerated a sudden decline in salinity and survived for 548.3 min in fresh water. Observations from this study indicate that a DP level around 43% could be optimum for L. vannamei in high-density culture systems in the absence of natural productivity. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1355557X
Volume :
41
Issue :
12
Database :
Academic Search Index
Journal :
Aquaculture Research
Publication Type :
Academic Journal
Accession number :
54908158
Full Text :
https://doi.org/10.1111/j.1365-2109.2010.02585.x