Journal
FISHERIES SCIENCE
Volume 71, Issue 2, Pages 257-262Publisher
JAPANESE SOC FISHERIES SCIENCE
DOI: 10.1111/j.1444-2906.2005.00958.x
Keywords
fermented vegetable product; immunostimulation; Japanese flounder; nonspecific immunity
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The stimulatory effect of fermented vegetable product (FVP) upon the phagocytic and superoxide generation of leukocytes was studied in the Japanese flounder Paralichthys olivaceus. The phagocytic activity of casein-induced, intraperitoneal leukocytes was investigated and quantified, that is the activity significantly increased (P < 0.05 or < 0.01) by the addition of FVP beyond 3 mg/kg body weight. Further analysis investigated the effect of FVP on superoxide generation in leukocytes. Established in vitro cytochrome c reduction assay was used to measure superoxide generation; reduced levels of FVP in assay samples had a profound effect on superoxide generation. FVP was also incorporated in commercial diets and fed to Japanese flounder for 4 weeks. The phagocytic activities and superoxide generation of peritoneal induced leukocytes were significantly higher (P < 0.05, < 0.01) in fish fed the FVP supplemented diet than fish fed the control diet. FVP feeding in fish had a significantly higher (P< 0.05) activity of lysozyme than in the control fish.
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