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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
- Source :
-
Aquaculture Research . Nov2010, Vol. 41 Issue 12, p1845-1854. 10p. 5 Charts, 1 Graph. - Publication Year :
- 2010
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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