The Effect of Mannan Oligosaccharide Supplementation on Atlantic Salmon Smolts (Salmo salar L.) Fed Diets with High Levels of Plant Proteins
- *Corresponding Author:
- Arkadios Dimitroglou
Aquaculture and Fish Nutrition Research Group
School of Biological Sciences
University of Plymouth
Plymouth, PL4 8AA, UK
Tel: +30 6973550751
E-mail: [email protected]
- John W Sweetman
Alltech Aqua, 28200 Lixouri
Tel: + 30 6944554446
E-mail: [email protected]
Received Date: July 05, 2011; Accepted Date: November 05, 2011; Published Date: November 15, 2011
Citation: Dimitroglou A, Reynolds P, Ravnoy B, Johnsen F, Sweetman JW, et al. (2011) The Effect of Mannan Oligosaccharide Supplementation on Atlantic Salmon Smolts (Salmo salar L.) Fed Diets with High Levels of Plant Proteins. J Aquac Res Development S1:011. doi:10.4172/2155-9546.S1-011
Copyright: © 2011 Dimitroglou A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
An experiment was conducted to investigate the effect of dietary mannan oligosaccharide (MOS) supplementation on Atlantic salmon ( Salmo salar L.) smolts (~ 47 g) reared in sea cages. The first treatment (control) consisted of fish fed the basal diet and the second treatment (MOS) fish were fed the same basal diet supplemented with 0.4% MOS. In the basal diet, 51.8% of the diet protein was derived from fish meal and 48.2% from vegetable protein (e.g. soy and wheat). After 14 weeks feeding on the experimental diets the results demonstrated that MOS supplementation did not affect growth performance, however, body protein composition was significantly increased. Additionally, liver histochemistry revealed that glycogen deposition in liver tissue increased from 1.80 ± 0.73 AU in the control fed fish to 2.58 ± 0.91 AU in the MOS fed fish.
Histology of the anterior intestine demonstrated that MOS supplementation produced a significantly higher absorptive surface of 4.63 ± 0.62 AU compared to the control fed fish of 3.65 ±0.49 AU. The microvilli density was also significantly higher in the anterior intestine in the MOS fed fish,12.02 ± 5.95 AU, when compared to the control fed fish 5.90 ± 1.53 AU. Similar results for the absorptive area and microvilli density were observed in the posterior intestinal region.Microvilli length increased in the posterior intestine from 1.10 ± 0.18 μm in the control group to 1.41 ± 0.19 μm in the MOS fed fish. Furthermore, counts of sea lice attached to fish and total number of fish infected by sea lice were significantly lower in the MOS fed fish. The present study shows that 0.4% MOS supplementation was able to improve intestinal morphology, increase carcass protein content and glycogen deposition in the liver.