Journal
FISH & SHELLFISH IMMUNOLOGY
Volume 86, Issue -, Pages 480-485Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2018.11.077
Keywords
Microbial lysozyme; Rainbow trout; Skin mucosal immunity; Immune-related gene expression
Funding
- Functional Food Research Center for Well-being, Chiang Mai University, Chiang Mai, Thailand
- GUASNR
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A two-month study was conducted to determine the influence of different levels of microbial lysozyme (LZ) contents (0, 0.5, 1.0, and 1.5 g kg(-1) of diet) on growth performance, serum and skin mucus immune parameters as well as intestinal immune-related genes expression in rainbow trout Oncorhynchus mykiss fingerlings (5.5 +/- 0.1 g). Growth performance and feed utilization were not affected significantly by dietary LZ. Fish fed 12-supplemented diets had higher serum total immunoglobulins concentration than the control group. In addition, fish fed 1.5 g LZ kg(-1) diet had the highest skin mucosal total protein and immunoglobulin contents compared to other experimental groups. Furthermore, skin mucosal lysozyme and alkaline phosphatase activities as well as intestinal tumor necrosis factor-alpha and interlukine-1 beta relative genes expression were higher in fish fed 1.0 and 1.5 g LZ kg(-1) diets than the other groups. Overall, the present results clearly showed that LZ powder can be considered as a potential immunostimulant in O. mykiss fingerlings, but in the long term period it may result in negative effects on intestinal health as a consequence of inducing pro-inflammatory cytokines gene expression in the intestine.
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